a) Cairo, Egypt: Solar-zenith angle is 60° for all dates. b) Kolkata, India: Solar-zenith angle is 67.5° for all dates. c) Manila, Philippines: Solar-zenith angle is 75.4° for all dates. d) Lagos, Nigeria: Solar-zenith angle is 83.55° for all dates. e) North Pole: Solar-zenith angle is 90° on the Winter Solstice.
To determine the solar-zenith angles for the given cities on specific dates, we need to calculate the angle between the zenith (directly overhead) and the position of the Sun at the specified times. The solar-zenith angle is dependent on the latitude, longitude, and date. Here are the solar-zenith angles for each city and date:
a) Cairo, Egypt:
Summer Solstice (June 21): Solar-zenith angle = 90° - θ, where θ is the latitude (30°). Therefore, solar-zenith angle = 90° - 30° = 60°.
Autumn Equinox (September 23): Solar-zenith angle = 90° - θ = 90° - 30° = 60°.
Winter Solstice (December 21): Solar-zenith angle = 90° - θ = 90° - 30° = 60°.
Spring Equinox (March 21): Solar-zenith angle = 90° - θ = 90° - 30° = 60°.
b) Kolkata, India:
Summer Solstice (June 21): Solar-zenith angle = 90° - θ, where θ is the latitude (22.5°). Therefore, solar-zenith angle = 90° - 22.5° = 67.5°.
Autumn Equinox (September 23): Solar-zenith angle = 90° - θ = 90° - 22.5° = 67.5°.
Winter Solstice (December 21): Solar-zenith angle = 90° - θ = 90° - 22.5° = 67.5°.
Spring Equinox (March 21): Solar-zenith angle = 90° - θ = 90° - 22.5° = 67.5°.
c) Manila, Philippines:
Summer Solstice (June 21): Solar-zenith angle = 90° - θ, where θ is the latitude (14.6°). Therefore, solar-zenith angle = 90° - 14.6° = 75.4°.
Autumn Equinox (September 23): Solar-zenith angle = 90° - θ = 90° - 14.6° = 75.4°.
Winter Solstice (December 21): Solar-zenith angle = 90° - θ = 90° - 14.6° = 75.4°.
Spring Equinox (March 21): Solar-zenith angle = 90° - θ = 90° - 14.6° = 75.4°.
d) Lagos, Nigeria:
Summer Solstice (June 21): Solar-zenith angle = 90° - θ, where θ is the latitude (6.45°). Therefore, solar-zenith angle = 90° - 6.45° = 83.55°.
Autumn Equinox (September 23): Solar-zenith angle = 90° - θ = 90° - 6.45° = 83.55°.
Winter Solstice (December 21): Solar-zenith angle = 90° - θ = 90° - 6.45° = 83.55°.
Spring Equinox (March 21): Solar-zenith angle = 90° - θ = 90° - 6.45° = 83.55°.
e) North Pole (Santa's workshop):
Winter Solstice (December 21): At the North Pole, the solar-zenith angle on the Winter Solstice would be 90° since the Sun is at its lowest point in the sky, just above the horizon.
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If the needle on the pressure gauge is fluctuating, read and record the valve located:
Select one:
a. at the lowest extreme.
b. where the needle appears to stay the longest.
c. in the center between the high and low extremes.
d. at the highest extreme.
A fluctuating needle could indicate a variety of issues, including mechanical or electrical problems with the gauge, an issue with the system being measured, or environmental variables affecting the measurement. When a needle is fluctuating, it can be difficult to determine the correct reading. If the needle on the pressure gauge(GP) is fluctuating, read and record the valve located in the center between the high and low extremes.
What is the pressure gauge?A pressure gauge is a device that determines and measures the pressure(P) of a gas or liquid in a closed container. A pressure gauge measures pressure by means of a bourdon tube(BT), which is a mechanical system. When pressure is put on it, it deforms. This deformation is calculated by a system of gears and springs and displayed on a dial.
What are the types of gauges?The following are some of the most common types of pressure gauges: Manometer(Mr) is a kind of pressure gauge that works by comparing the pressure of a liquid in a U-shaped tube to the pressure of the gas being measured, which compresses the liquid. Piezometer(Pr) is a form of pressure gauge that works by measuring the weight of the liquid in a container, which is proportional to the pressure being measured. Bourdon Tube: The most common type of pressure gauge is the bourdon tube. It works by comparing the pressure of a gas or liquid in a chamber to a spring inside a tube. Wheel Gauge is a kind of pressure gauge that works by converting pressure into a rotary motion. This rotary motion is measured by a series of gears, which then display the pressure.
What is a fluctuating needle?
A fluctuating needle(FN) is a needle that is not steady on a gauge or instrument.
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A uniform wave traveling in a medium with Er1=4 is normally incident upon a second medium with Er2=2.25. both media are non magnetic and non conductive the electric field of the incident wave is Ei(z,t)=x10cos(2pi x 10^10t-kz) (V/m)
A) find the phase velocities in the two media, respectively
B) find the wavelengths in the two media
C) find the reflection and transmission coefficients and the standing wave ratio (S)
a) The phase velocity is 2c / 3
b) The wavelengths of the two media are λ₁ = λ₀ / 2 and λ₂ = λ(2/3) λ₀
c) The reflection and transmission coefficients are -1/7 and 4/7 respectively with standing wave ratio S = 1/4.
Given data:
A)
The phase velocity of a wave in a medium is given by v = c / √(εr), where c is the speed of light in vacuum and εr is the relative permittivity of the medium.
For the first medium with εr₁ = 4, the phase velocity is v₁ = c / √(εr₁) = c / √(4) = c / 2.
For the second medium with εr₂ = 2.25, the phase velocity is v₂ = c / √(εr₂) = c / √(2.25) = c / 1.5 = 2c / 3.
B)
The wavelength of a wave in a medium is given by λ = v / f, where λ is the wavelength, v is the phase velocity, and f is the frequency of the wave.
In the first medium:
λ₁ = v₁ / f = (c / 2) / 10¹⁰ = c / (2 x 10¹⁰) = λ₀ / 2, where λ₀ is the wavelength in vacuum.
In the second medium:
λ₂ = v₂ / f = (2c / 3) / 10¹⁰ = (2/3) (c / 10¹⁰) = (2/3) λ₀.
C)
The reflection coefficient (R) and transmission coefficient (T) can be calculated using the formulas:
R = (Z₂ - Z₁) / (Z₂ + Z₁),
T = 2Z₂ / (Z₂ + Z₁),
S = |R / T|,
where Z₁ and Z₂ are the characteristic impedances of the two media, respectively.
Since both media are non-magnetic and non-conductive, the characteristic impedance is given by Z = √(μr / εr), where μr is the relative permeability of the medium.
For the first medium with εr₁ = 4 and μr₁ = 1, Z₁ = √(μr₁ / εr₂) = √(1 / 4) = 1/2.
For the second medium with εr₂ = 2.25 and μr₂ = 1, Z₂ = √(μr₂ / εr₂) = √(1 / 2.25) = 2/3.
Using these values, we can calculate the reflection coefficient:
R = (Z₂ - Z₁) / (Z₂ + Z₁) = (2/3 - 1/2) / (2/3 + 1/2) = -1/7.
The transmission coefficient is given by:
T = 2Z₂ / (Z + Z₁) = 2(2/3) / (2/3 + 1/2) = 4/7.
So, the standing wave ratio (S) is the absolute value of the reflection coefficient divided by the transmission coefficient:
S = |R / T| = |-1/7 / (4/7)| = 1/4.
Hence, the standing wave ratio S = 1/4.
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19. In an experiment, a bird was taken from its nest, flown 5150 km away, and released. The bird flew directly back to its nest 13.5 days after release. If we place the origin in the nest and extend the + x-axis to the release point, find the bird's average velocity for the return flight. A. -5.54 m s.¹ B. -4.42 m s-¹ C. -2.04 m s-¹ D. 1.35 m s-¹ E. 3.15 m s-¹
Motion is described in terms of the distance travelled by an object during a certain period of time and in a particular direction, as well as the object's average velocity. The correct option is E. 3.15 m s⁻¹The formula for average velocity is:Average velocity = Total displacement ÷ Time taken
Where;Total displacement = displacement of
The bird = - 5150 km ( since it is flying back to its nest)
Time taken = 13.5 days = 13.5 × 24 × 60 × 60 seconds = 1166400 s
Average velocity = - 5150 × 10³ m ÷ 1166400 s = - 4.416 m s⁻¹
Therefore, the bird's average velocity for the return flight is - 4.416 m s⁻¹ (Rounded to three significant figures).
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A resistor develops 200 J of thermal energy in a time of 10.0s when a current of 1 A is passed through it. If the current is increased to 4 A, what will be the energy (in Joules) developed in 10 s.?
Answer:
[tex]3200\; {\rm J}[/tex].
Explanation:
The power [tex]P[/tex] (rate at which energy is consumed) of an electric circuit is equal to the product of voltage [tex]V[/tex] and current [tex]I[/tex]:
[tex]P = V\, I[/tex].
By Ohm's Law, the current in a resistor is proportional to the voltage in that resistor:
[tex]V = I\, R[/tex],
Where [tex]R[/tex] is the resistance of the resistor.
Substitute the expression for [tex]V[/tex] into the equation for power:
[tex]P = (I\, R)\, I = I^{2}\, R[/tex].
In other words, if resistance stays the same, the rate [tex]P[/tex] at which energy is consumed would be proportional to the square of current.
Hence, when current in this resistor is quadrupled, power consumed would increase to [tex]4^{2} = 16[/tex] times the initial value assuming that resistance stays the same. In the same amount of time, the resistor would now consume:
[tex]16\times 200\; {\rm J} = 3200\; {\rm J}[/tex].
(a) During a thermodynamic cycle gas undergoes three different processes beginning at an initial state where p₁-1.5 bar, V₁ =2.5 m³ and U₁ =61 kJ. The processes are as follows: (i) Process 1-2: Compression with pV= constant to p2 = 3 bar, U₂ = 710 kJ 3 (ii) Process 2-3: W2-3 = 0, Q2-3= -200 kJ, and (iii) Process 3-1: W3-1 = +100 kJ. Determine the heat interactions for processes 1-2 and 3-1 i.e. Q1-2 and Q3-1. (b) A and B are two reversible Carnot engines which are connected in series working between source temperature of 1500 K and sink temperature of 200 K, respectively. Carnot engine A gets 2000 kJ of heat from the source (maintained at temperature of 1500 K) and rejects heat to second Carnot engine i.e. B. Carnot engine B takes the heat rejected by Carnot engine A and rejects heat to the sink maintained at temperature 200 K. Assuming Carnot engines A and B have same thermal efficiencies, determine: a. Amount of heat rejected by Carnot engine B b. Amount of work done by each Carnot engines i.e. A and B c. Assuming Carnot engines A and B producing same amount of work, calculate the amount of heat received by Carnot B and d. Thermal efficiency of Carnot engines A and B, respectively.
The thermal efficiencies of Carnot engines A and B are 0.867 and 0
(a) In process 1-2, the gas undergoes compression with pV = constant, which indicates an isothermal process. Therefore, the heat interaction for process 1-2, Q1-2, can be determined using the equation Q1-2 = U2 - U1, where U2 and U1 are the initial and final internal energies, respectively.
Substituting the given values, Q1-2 = 710 kJ - 61 kJ = 649 kJ.
In process 3-1, the work done, W3-1, is positive, indicating that work is done on the system. Since the gas is returning to its initial state, the change in internal energy, ΔU, must be zero.
Therefore, the heat interaction for process 3-1, Q3-1, is given by Q3-1 = -W3-1 = -100 kJ.
(b) In a series connection of two Carnot engines, the efficiency of both engines is the same. The efficiency of a Carnot engine is given by η = 1 - (Tc/Th), where Tc is the temperature of the cold reservoir (sink) and Th is the temperature of the hot reservoir (source).
(a) The amount of heat rejected by Carnot engine B is equal to the amount of heat received from Carnot engine A, which is 2000 kJ.
(b) The work done by each Carnot engine can be calculated using the equation W = Qh - Qc, where Qh is the heat absorbed from the hot reservoir and Qc is the heat rejected to the cold reservoir. For both engines, the work done is equal to the heat absorbed from the hot reservoir.
Therefore, the work done by Carnot engine A and B is 2000 kJ each.
(c) Since both engines produce the same amount of work, the heat received by Carnot engine B is equal to the heat rejected by engine A, which is 2000 kJ.
(d) The thermal efficiency of a Carnot engine can be calculated using the equation η = 1 - (Tc/Th).
For engine A, the efficiency is ηA = 1 - (200/1500) = 0.867, and for engine B, the efficiency is ηB = 1 - (200/200) = 0. Therefore, the thermal efficiencies of Carnot engines A and B are 0.867 and 0, respectively.
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Choose the sentence that is NOT a run-on sentence.
Group of answer choices
a. Death Valley National Monument, located in southern California and Nevada, is one of the hottest places on Earth, temperatures there have soared as high as 134 degrees Fahrenheit.
B. Death Valley National Monument, located in southern California and Nevada, is one of the hottest places on Earth; temperatures there have soared as high as 133 degrees Fahrenheit.
Death Valley National Monument, located in southern California and Nevada, is one of the hottest places on Earth; temperatures there have soared as high as 133 degrees Fahrenheit.
In this sentence, the use of a semicolon correctly separates the two independent clauses, making it a properly punctuated sentence. It combines two related pieces of information about Death Valley National Monument: its location and the extreme temperatures it experiences. The semicolon effectively connects the two ideas without creating a run-on sentence.
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for an ap projection of the coccyx, the central ray is directed:
For an AP projection of the coccyx, the central ray is directed: The central ray is angled 10 degrees cephalic to the coccyx. The patient is placed in the prone position for this projection. The coccyx is clearly visible on the AP projection because it is projected through the symphysis pubis and the sacrum.
The distal end of the coccyx is visible as well. This AP projection is commonly used to detect sacrococcygeal injuries that are not seen on other projections. In an AP projection of the coccyx, the central ray is directed through the body part of interest from posterior to anterior, in this case, the coccyx. The central ray is angled cephalic to the coccyx at an angle of about 10 degrees, which helps to separate the coccyx from the sacrum and pelvic floor.
The technique for taking the projection is crucial. The patient should lie prone, with their hips extended, and their legs together, in order to correctly position the coccyx. The central ray should be positioned perpendicular to the area of interest, which is the coccyx. Finally, the image should be captured during quiet respiration, as the coccyx is typically displaced by respiratory movement.
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A 500 N cube of density rho = 1800 kg/m3 falls through water at a
constant speed
U. Determine U if the cube falls with an orientation to minimize
the drag force. Hint: don’t
forget buoyancy.
Determine U if the cube falls with an orientation to minimize the drag force, we need to use buoyancy. The formula for the buoyant force is given by Fb = ρVg.
V is the volume of the object displaced by the water, ρ is the density of the liquid (water), and g is the acceleration due to gravity. We can use this formula to find the weight of the cube in water.
Let W be the weight of the cube in air, then the weight of the cube in water is given by W - Fb. The buoyant force Fb is given by
Fb = ρVg
= (1800 kg/m³)(0.125 m³)(9.81 m/s²)
= 2212.5 N.
The weight of the cube in air is given by
W = mg
= (500 N)/(9.81 m/s²)
= 50.91 kg.
The weight of the cube in water is given by W - Fb = 50.91 kg - 2212.5 N = -2161.59 N.
We can set these two forces equal to each other and solve for U:
FD = W - Fb(1/2)ρCU²A
= W - FbU
= sqrt((2(W - Fb))/(ρCA))
Plugging in the values, we get
U = sqrt((2((50.91 kg)(9.81 m/s²) - 2212.5 N))/(1000 kg/m³)(0.25 m²)(0.8))
≈ 1.44 m/s.
The cube falls at a constant speed of 1.44 m/s when oriented to minimize the drag force.
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A 20 MHz uniform plane wave travels in a lossless material with the following features:
student submitted image, transcription available below
Calculate (remember to include units):
a) The phase constant of the wave.
b) The wavelength.
c) The speed of propagation of the wave.
d) The intrinsic impedance of the medium.
e) The average power of the Poynting vectorr or Irradiance, if the amplitude of the electric field Emax = 100V/m.
f) If the wave hits an RF field detector with a square area of 1 cm × 1 cm, how much power in Watts would the display read?
To calculate the various quantities for a 20 MHz plane wave in a lossless material, let's go through each part step by step:
a) The phase constant (β) of the wave can be calculated using the formula:
β = 2πf/v,
where f is the frequency (20 MHz) and v is the velocity of propagation.
b) The wavelength (λ) can be determined using the formula:
λ = v/f,
where f is the frequency (20 MHz) and v is the velocity of propagation.
c) The speed of propagation (v) can be calculated using the formula:
v = λf,
where λ is the wavelength and f is the frequency (20 MHz).
d) The intrinsic impedance (Z) of the medium is given by the formula:
Z = sqrt(μ/ε),
where μ is the permeability of the medium and ε is the permittivity of the medium. Since the medium is lossless, both μ and ε are constant values.
e) The average power of the Poynting vector or irradiance can be calculated using the formula:
Pavg = 0.5 * ε * Emax^2,
where ε is the permittivity of the medium and Emax is the maximum electric field amplitude (100 V/m).
f) To calculate the power detected by an RF field detector with a square area of 1 cm × 1 cm, we need to calculate the intensity (power per unit area). The power detected will depend on the orientation and alignment of the detector with respect to the wave. If we assume the detector is perfectly aligned and perpendicular to the wave, the power detected can be calculated by multiplying the intensity (Pavg/A), where Pavg is the average power calculated in part (e), and A is the area of the detector (1 cm × 1 cm).
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For a tidal range at a particular place with 2 tides daily of 10 m, and the surface tidal energy harnessing plant of 9 km², if the specific gravity of water is 1025.18 kg/m³, determine the total energy potential per day of the plant. [8]
The total energy potential per day of the plant is 4.4 * 10¹³ J i.e.
440 quadrillion joules of energy per day.
The total energy potential per day of the plant can be calculated using the following formula:
Total energy potential = (2 * tidal range * surface area * specific gravity * acceleration due to gravity) / 2
where:
tidal range is the difference between the high tide and low tide, in meters
surface area is the area of the tidal energy harnessing plant, in square meters
specific gravity of water is the ratio of the density of water to the density of air, in kg/m³
acceleration due to gravity is the acceleration caused by the Earth's gravity, in m/s²
In this case, we have:
tidal range = 10 m
surface area = 9 km² = 9 * 10⁶ m²
specific gravity of water = 1025.18 kg/m³
acceleration due to gravity = 9.81 m/s²
Substituting these values into the formula, we get:
Total energy potential = (2 * 10 m * 9 * 10⁶ m²* 1025.18 kg/m³*9.81 m/s²)/ 2 Total energy potential = 4.4 * 10¹³ J
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Pls. Solve them both pls pls
(2) Write the matrix state equation for the circuit shown below.
Exercise (1) Write the matrix state-variable equation for the above circuit.
(1) For the given circuit shown below, the matrix state-variable equation is given as:[tex]X = [ V1, V2, iL ]'Q = [ Vi, iL ]'[/tex]where ' denotes transpose of matrix.Now, to get the state-variable equation, we have to apply KVL to the loops of the circuit. Applying KVL to the given circuit,
we get the following equations:Loop 1: Vi - V1 - L * diL/dt - R1 * iL = 0Loop 2: V1 - V2 - R2 * iL = 0Differentiating both the above equations with respect to time, we get:Loop 1: dVi/dt - dV1/dt - L * d²iL/dt² - R1 * diL/dt = 0Loop 2: dV1/dt - dV2/dt - R2 * diL/dt = 0Now, using matrices, the above equations can be represented as:For loop 1: [ dV1/dt, diL/dt, dVi/dt ] = [ R1/L, -1/L, -1/L ] * [ V1, iL, Vi ]For loop
we have to first identify the state variables and write their first and second derivatives. The state variables are:iC, charge stored on the capacitorV2, voltage across the capacitorDifferentiating the above state variables with respect to time, we get:diC/dt = iL - C * dV2/dt... (1)dV2/dt = 1/C * iC... (2)Now, to write the matrix state equation, we can represent equation (1) and (2) in matrix form as:dX/dt = [ -1/RC, -1/R;1/C, 0 ] * X + [ 1, 0 ] * VwhereX = [ iC, V2 ]'V = [ V1 ]'Rearranging the above equation, we get:dX/dt = AX + BUwhere[tex]X = [ iC, V2 ]'U = [ V1 ]'Y = [ V2 ]'A = [ -1/RC, -1/R;1/C, 0 ]B = [ 1, 0 ]C = [ 0, 1 ]D = [ 0 ][/tex]Therefore, the matrix state equation for the given circuit is:dX/dt = [ -2, -1;-2, 0 ] * X + [ 1 ] * V1U = [ 0, 1 ] * X + [ 0 ]
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(a) During a thermodynamic cycle gas undergoes three different processes beginning at an initial state where pr-1.5 bar, V₁ =2.5 m³ and U₁=61 kJ. The processes are as follows: (i) Process 1-2: Compression with pV= constant to p2 = 3 bar, U₂ = 710 kJ 3 (ii) Process 2-3: W2-3 = 0, Q2-3-200 kJ, and (iii) Process 3-1: W3-1 = +100 kJ. Determine the heat interactions for processes 1-2 and 3-1 i.e. Q1-2 and Q3-1. (b) A and B are two reversible Carnot engines which are connected in series working between source temperature of 1500 K and sink temperature of 200 K, respectively. Carnot engine A gets 2000 kJ of heat from the source (maintained at temperature of 1500 K) and rejects heat to second Carnot engine i.e. B. Carnot engine B takes the heat rejected by Carnot engine A and rejects heat to the sink maintained at temperature 200 K. Assuming Carnot engines A and B have same thermal efficiencies, determine: a. Amount of heat rejected by Carnot engine B b. Amount of work done by each Carnot engines i.e. A and B c. Assuming Carnot engines A and B producing same amount of work, calculate the amount of heat received by Carnot B and d. Thermal efficiency of Carnot engines A and B, respectively. c) A flat plate of area = 0.5 m² is pulled at a constant speed of 25 cm/sec placed parallel to another stationary plate located at a distance 0.05 cm. The space between two plates is filled with a fluid of dynamic viscosity =0.004 Ns/m². Calculate the force required to maintain the speed of the plate in the fluid.
The force required to maintain the speed of the plate in the fluid is 0.02 N.
(a) For process 1-2, which is compression with pV = constant, it is an isothermal process. The heat interaction for this process, Q1-2, can be determined using the equation Q1-2 = U2 - U1, where U2 and U1 are the initial and final internal energies, respectively. Substituting the given values, Q1-2 = 710 kJ - 61 kJ = 649 kJ.
For process 3-1, the work done, W3-1, is positive, indicating that work is done on the system. Since the gas is returning to its initial state, the change in internal energy, ΔU, must be zero. Therefore, the heat interaction for process 3-1, Q3-1, is given by Q3-1 = -W3-1 = -100 kJ.
(b) In a series connection of two Carnot engines with the same thermal efficiencies, the heat rejected by engine A is equal to the heat received by engine B. Given that engine A receives 2000 kJ of heat, the amount of heat rejected by engine B is also 2000 kJ.
The work done by each Carnot engine is equal to the heat absorbed from the source. Therefore, both engine A and engine B do 2000 kJ of work.
Assuming both engines produce the same amount of work, the heat received by engine B is also 2000 kJ.
The thermal efficiency of a Carnot engine is given by η = 1 - (Tc/Th), where Tc is the temperature of the cold reservoir (sink) and Th is the temperature of the hot reservoir (source).
In this case, the temperatures are given as 200 K and 1500 K, respectively. Therefore, the thermal efficiency of both Carnot engines A and B is η = 1 - (200/1500) = 0.867.
(c) To calculate the force required to maintain the speed of the plate in the fluid, we can use the formula for viscous drag force: F = η * A * v / d, where η is the dynamic viscosity of the fluid, A is the area of the plate, v is the velocity of the plate, and d is the distance between the plates.
Substituting the given values, η = 0.004 Ns/m², A = 0.5 m², v = 25 cm/sec = 0.25 m/sec, and d = 0.05 cm = 0.0005 m, we can calculate the force as follows:
F = (0.004 Ns/m²) * (0.5 m²) * (0.25 m/sec) / (0.0005 m) = 0.02 N
Therefore, the force required to maintain the speed of the plate in the fluid is 0.02 N.
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Like a baseball bat, a tennis racket has a sweet spot at its center of percussion. If a tennis ball hits this center of percussion, the racket's handle does not accelerate. This is because
A) an impact at the center of percussion exerts no torque about the racket's centerof mass and doesn't cause the racket to undergo angular acceleration.
B) the racket's center of mass accelerates backward while its handle rotatesforward about its center of mass and the two motions cancel one another at the handle.
C) an impact at the center of percussion transfers no momentum to the racket anddoesn't cause the racket to accelerate.
D) the racket's velocity doesn't change when the ball hits its center of percussion
A tennis racket is just like a baseball bat, which has a sweet spot at its center of percussion. When a tennis ball strikes this spot, the racket handle doesn't accelerate. This is because an impact at the center of percussion exerts no torque around the racket's center of mass and does not cause the racket to undergo angular acceleration.
Similar to a baseball bat, a tennis racket has a center of percussion, and when the ball hits that spot, the racket handles do not accelerate. A force or torque applied to an object tends to accelerate the object in the direction of the force or torque. When a tennis ball is hit off-center with a racket, a torque or force is applied to the racket, and it tends to rotate about its center of mass.
As a result, the racket's handle will accelerate.Since the force applied to the tennis ball when it strikes the center of percussion is in line with the racket's center of mass, there is no torque acting on the racket. The racket does not undergo angular acceleration, which is why the handle does not accelerate.
Hence, option A, an impact at the center of percussion exerts no torque about the racket's center of mass and doesn't cause the racket to undergo angular acceleration, is the correct answer.
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Object 1 has a mass of 30,000kg. Object 2 has a mass of 50,000kg. Object 3 has a mass of 75,000kg. Object 2 is 3m to the right of Object 1. Object 3 is 5m to the right of Object 2. What is the net force acting on Object 3 due to Objects 1 and 2?
A cat of mass 10kg is standing on the end of a ceiling fan blade of 0.75m rotating at 2.3rad/s. What is the minimum coefficient of static friction between the cat and the fan blade?
A rotisserie chicken rotates at 0.25rev/s. When the power is shut off it takes the rotisserie chicken 3rev to come to a full stop. What is the angular acceleration of the rotisserie chicken, assuming the acceleration is constant?
A circular saw rotates at a rate of 25rad/s. A setting is changed to make the rotation rate increase at a rate of 0.5rad/s^2. What is the angular speed of the blade after 1.5s?
The angular speed of the blade after 1.5s is 26.25 rad/s.
1. The net force acting on Object 3 due to Objects 1 and 2The net force acting on Object 3 due to Objects 1 and 2 is as follows. Let us first calculate the gravitational force between object 1 and object 3.
The formula used to calculate gravitational force is F = (Gm1m2) / d2G is the gravitational constant, m1 and m2 are the masses of two objects, and d is the distance between the centers of the two objects
.F = (6.67 x 10-11) [(30,000 kg) (75,000 kg) / (5 m)2]
F = 6.0 x 10-6 N
Now, let's calculate the gravitational force between object 2 and object 3.
F = (6.67 x 10-11) [(50,000 kg) (75,000 kg) / (2 m)2]
F = 2.5 x 10-5 N
The direction of the gravitational force between Object 3 and Object 1 is to the right, while the direction of the gravitational force between Object 3 and Object 2 is to the left.
Fnet = F3,2 + F3,1
Fnet = (2.5 x 10-5 N) - (6.0 x 10-6 N)
Fnet = 1.9 x 10-5 N (to the left)
2. Minimum coefficient of static friction between the cat and the fan blade. The minimum coefficient of static friction between the cat and the fan blade is given by μs = v2 / rg
where v = 2.3 rad/s (angular velocity of the blade)
r = 0.75 m (radius of the fan blade)g = 9.8 m/s2 (acceleration due to gravity)
m = 10 kg (mass of the cat)μs = v2 / rgμs = (2.3 rad/s)2 / (0.75 m)(9.8 m/s2)
μs = 0.21 (approximately)3. Angular acceleration of the rotisserie chicken, assuming the acceleration is constant The angular acceleration of the rotisserie chicken, assuming the acceleration is constant is given by the formula:
α = (ωf - ωi) / twhere ωi = 0.25 rev/s (initial angular velocity)ωf = 0 rev/s (final angular velocity)
t = 3 rev / (0.25 rev/s) (time taken to come to a full stop)
α = (ωf - ωi) / tα
= (0 - 0.25 rev/s) / (3 rev / (0.25 rev/s))
α = - 0.02 rev/s2 (negative sign indicates deceleration)4. Angular speed of the blade after 1.5sThe angular speed of the blade after 1.5s is given by the formula:ωf = ωi + αt
where ωi = 25 rad/s (initial angular velocity)α = 0.5 rad/s2 (angular acceleration)t = 1.5 sωf = ωi + αtωf = 25 rad/s + (0.5 rad/s2) (1.5 s)ωf = 26.25 rad/s (approximately)
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Biological fluid mechanics, please answer all questions or at
least as much as possible
(a) The governing principles in fluid mechanics are described analyticaly by the conservation laws for mass, momentum, and energy. These can be stated either in integral form when applied to an extend
Biological fluid mechanics is a rapidly growing field of study that uses the principles of fluid mechanics to understand the behavior of fluids in biological systems. This includes the study of blood flow, mucus transport, and the swimming of microorganisms.
The field is essential for understanding the functioning of many biological systems and has led to new insights into the behavior of living organisms.
Biological fluid mechanics is a multidisciplinary field that draws on the expertise of engineers, physicists, biologists, and mathematicians.
As the field continues to develop, we can expect to see new applications in fields such as medicine, environmental science, and robotics.
Here are some of the specific applications of biological fluid mechanics:
Medicine: Biofluid mechanics can be used to design new medical devices, such as artificial heart valves and catheters.
Environmental science: Biofluid mechanics can be used to understand the transport of pollutants in water and air.
Robotics: Biofluid mechanics can be used to design robots that can swim or fly like animals.
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How does the time of fall relate to the weight (mg) of the coffee filters? What happens to the time of fall if you double the mass of falling filters? Explain
The time of fall of an object is not directly related to its weight (mg), but rather to the acceleration due to gravity (g) and the distance it falls.
In the case of coffee filters, assuming they have a similar shape and size, the weight (mg) will be proportional to the mass (m) of the filters.
Doubling the mass of the falling filters will not have a direct effect on the time of fall if we assume that air resistance is negligible. According to the equation for the time of fall, which is derived from the
kinematic equations:
Time = √((2 * distance) / g)
The mass of the falling object does not appear in this equation. Therefore, doubling the mass will not change the time of fall if other factors such as distance and acceleration due to gravity remain constant.
However, in real-world scenarios, where air resistance is present, the time of fall can be affected by the mass of the falling filters. Increased mass can lead to increased air resistance, which can slow down the filters and increase the time of fall. This effect becomes more significant as the mass and size of the falling object increase.
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A
diatomic molecule has dissociation energy of 2.5 ev and bond length
r is 0.15nm. Find constants of repulsive force.
A diatomic molecule has dissociation energy of 2.5 ev and bond length r is 0.15nm, the constants of repulsive force is A = 1.39 x 10^-134 Jm^12 and B = k x A, where k is the constant of proportionality.
The potential energy of diatomic molecules is governed by Lennard-Jones potential, which is given by U(r) = (A/r^12) - (B/r^6), where A and B are the constants of repulsive force and attractive force, respectively. The dissociation energy of a diatomic molecule is the energy required to break the bond between the two atoms. If the bond length is known, the constants of repulsive force can be calculated using the following formula: A = (2.5 eV x 1.6 x 10^-19 J/eV) x (r/0.15 nm)^12 / 2B.
Here, the dissociation energy is converted from eV to joules, and r is converted from nm to meters. The result is in units of joules per meter to the power of 12. Plugging in the given values, we get: A = 1.39 x 10^-134 Jm^12 / B. Therefore, the constants of repulsive force can be expressed as A = 1.39 x 10^-134 Jm^12 and B = k x A, where k is the constant of proportionality.
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A 3-ph, Y-connected turbo alternator, having a synchronous reactance of 1002/ph and neglected resistance. The armature current of 220 A at unity p.f. and the supply voltage is constant at 11 kV, at constant frequency. A)- If the steam admission is unchanged and the induced emf raised by 25%, determine the current and power factor. B)- if the higher value of excitation is maintained and the steam supply is slowly increased at what power output will the armature brake away from synchronism?
A 3-ph, Y-connected turbo alternator, having a synchronous reactance of 100Ω/ph, and the neglected resistance. The armature current of 220A at unity p.f. and the supply voltage is constant at 11kV. Given:A. If the steam admission is unchanged and the induced emf raised by 25%, determine the current and power factor.
As we know that, induced emf (Eph) in the alternator is directly proportional to the supply voltage and the power factor, i.eEph ∝ Vph cosϕAt constant frequency, induced emf Eph1 at given conditions can be expressed as;Eph1 = Vph1 cos ϕ1 ……………. (1)New induced emf after an increase of 25% in Eph1 isEph2 = 1.25 Eph1We know that the power factor is constant, so;cos ϕ1 = cos ϕ2 = cos ϕNew value of induced emf after 25% increase in Eph1 is;Eph2 = 1.25 Eph1= 1.25 × Vph1 × cos ϕ1= 1.25 × 11 × 103 × (220/√3)/100= 360.83 Vph New line current after an increase of 25% in induced emf is,I2 = I1 (Eph2/Eph1)I2 = 220 (360.83/275.03)= 288.25 A.Therefore, the current in the alternator is 288.25 A.Power factor cos ϕ can be calculated as,cos ϕ = (P/S) = (√3 V L I cos ϕ)/(3 V L I) = cos ϕ
Therefore, power factor is unity or 1.0.B)- if the higher value of excitation is maintained and the steam supply is slowly increased at what power output will the armature break away from synchronism?The power output of the alternator is given by the formula;P = √3 Vph Ip cos ϕAt the point of breakaway or loss of synchronism, the developed torque Td is equal to the load torque TL, so;P = Tdωm = TLωmWe know that,ωm = 2πfAs the frequency and supply voltage are constant,ωm will be constant.So, P α TdAt constant power output, Td is constant. Therefore, the power output of the alternator remains constant at the breakaway point.
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6) The only difference between the shunt motor and a separately excited motor is that:
(A) A separately excited DC motor has its field circuit connected to an independent voltage supply
(B) The shunt DC motor has its field circuit connected to the armature terminals of the motor
(C) A and B
(D) The shunt DC motor has its armature circuit connected to the armature terminals of the motor
7) One of the following statements is true for DC-Separately Excited Generator (A) The no load characteristic same for increasing and decreasing excitation current
(B) The no load characteristic differ for increasing and decreasing excitation current
(C) The no load characteristic same for increasing and decreasing load resistance
(D) The load characteristic same for increasing and decreasing load resistance
6) The only difference between the shunt motor and a separately excited motor is that a separately excited DC motor has its field circuit connected to an independent voltage supply.
The shunt DC motor has its field circuit connected to the armature terminals of the motor. Therefore, the correct option is (A).
7) The correct statement for a DC-Separately Excited Generator is that the no-load characteristic differs for increasing and decreasing excitation current.
Therefore, the correct option is (B).
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The velocity v, in meters per second, is given as a function of time t, in seconds, by v(t) = -0.605t^2 + 2.11t - 8.15 What is the acceleration at time t = 3.47 s? Number ______ m/s^2
The acceleration at time t = 3.47 seconds is -2.077 m/s². Rounded to the nearest hundredth, this is -0.605 m/s².
The acceleration at time t = 3.47 seconds is -0.605 m/s². Given, the velocity v, in meters per second, is given as a function of time t, in seconds, by the equation:v(t) = -0.605t² + 2.11t - 8.15 The acceleration is the derivative of velocity.
Therefore, we can differentiate v(t) with respect to time t to obtain acceleration a(t).
Differentiating v(t) with respect to time t: a(t) = v'(t) = d/dt (-0.605t² + 2.11t - 8.15)
Now, the derivative of -0.605t² is -1.21t, the derivative of 2.11t is 2.11, and the derivative of -8.15 is zero.
Therefore, the acceleration a(t) is given by:a(t) = -1.21t + 2.11
The acceleration at time t = 3.47 seconds:a(3.47) = -1.21(3.47) + 2.11a(3.47) = -4.187 + 2.11a(3.47) = -2.077 m/s²
Therefore, the acceleration at time t = 3.47 seconds is -2.077 m/s². Rounded to the nearest hundredth, this is -0.605 m/s².
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A 200 g piece of ice at 0.00 °C is placed in 200 g of liquid water at 100 °C. When the system reaches equilibrium, the temperature is 10 °C. Find the change in entropy of the universe during this process.
The change in entropy of the universe during this process is -729.2 JK⁻¹. Total entropy change of the universe is calculated as ΔSuniverse = ΔSsurroundings + ΔSsystem
Given data; Mass of ice, m₁ = 200 g, Mass of liquid water, m₂ = 200 g, Temperature of ice, T₁ = 0 °C, Temperature of liquid water, T₂ = 100 °C, Temperature at equilibrium, T = 10 °C, The specific heat capacity of ice, cs₁ = 2.09 J/(gK)
The specific heat capacity of water, cs₂ = 4.18 J/(gK)
The latent heat of fusion of water, L = 333 J/g
The change in entropy of the universe during this process is; To find the change in entropy of the universe, we need to find the entropy change of the surroundings and the entropy change of the system. If we sum up the entropy change of the system and the surroundings, we will get the entropy change of the universe, i.e.
ΔSuniverse = ΔSsurroundings + ΔSsystem
Entropy change of the surroundings;
The water at 100 °C will lose heat to the surroundings until it reaches 10 °C. This will be an irreversible process, as it cannot be done without losing some energy as heat to the surroundings. The heat lost by the hot water, Q₂ = m₂ cs₂ (T₂ - T)
= 200 x 4.18 x (100 - 10)
= 75324 J
The heat gained by the surroundings, Qsurroundings = -Q₂
= -75324 J
As the process is irreversible, the entropy change of the surroundings can be calculated as; ΔSsurroundings = Qsurroundings/Tsurroundings = -75324/293
= -257.03 JK-1
Entropy change of the system;
The heat gained by the ice, Q₁= m₁L + m₁cs₁(T - T₁)
= 200 x 333 + 200 x 2.09 x (10 - 0)
= 133460 J
The system will lose heat to the surroundings until it reaches equilibrium, which is an irreversible process. The entropy change of the system can be calculated as;
ΔSsystem = -ΔQsystem/T
= -133460/283
= -472.17 JK⁻¹
Total entropy change of the universe;ΔSuniverse = ΔSsurroundings + ΔSsystem
= -257.03 + (-472.17)
= -729.2 JK⁻¹
Therefore, the change in entropy of the universe during this process is -729.2 JK⁻¹.
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A box moves 10\,\tex 10 m horizontally when force F=20\,\text N F = 20 N is applied at an angle \theta=30\degree . What is the work done on the box by FF during the displacement? 173 J 0-173 J 200 J -200 J
When a force of 20 N is applied at an angle of 30 degree to a box and it moves 10 m horizontally, the work done on the box by F during the displacement is 173 J. Work is defined as the energy transferred when a force is applied to an object and causes it to move in the direction of the force.
The formula to calculate work done is: W = F * d * cosθ where, W is work done F is the force applied d is the distance over which the force is appliedθ is the angle between the force and the displacement of the object W = 20 * 10 * cos30°= 173 J
The work done on the box by F during the displacement is 173 J.
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Which of the following is NOT a disadvantage of Wind Energy? Wind turbines are very tall and each takes a small plot of land. The force of the high blades is capable of harming wildlife. They are noisy. Large wind farms are needed to provide entire communities with enough electricity
The disadvantage of wind energy is that wind turbines can be noisy and the force of high blades can harm wildlife.
The disadvantages of wind energy include potential noise pollution caused by wind turbines and the risk of harm to wildlife due to the force of high blades. However, it is important to note that wind turbines being tall and occupying small plots of land are not considered disadvantages but rather requirements for efficient wind energy generation.
Additionally, large wind farms are needed to generate enough electricity to meet the demands of entire communities, which can present challenges in terms of land availability and infrastructure. Despite these drawbacks, wind energy remains a valuable and sustainable source of renewable energy, contributing to reducing greenhouse gas emissions and mitigating climate change.
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USE ORIGINAL ANSWER OR GET DOWNVOTED!
Explain the question in great detail and find the
highest-frequency square wave you can transmit.
Assuming that you could transmit digital data over FM broadcast
The question is related to transmitting digital data over FM broadcast, here is an answer: In order to transmit digital data over FM broadcast, one can use a process called frequency shift keying (FSK). FSK is a digital modulation technique that uses two frequencies to represent 0 and 1.
For example, one frequency can be used to represent a binary 0 and another frequency can be used to represent a binary 1.
By switching between these two frequencies, digital data can be transmitted over FM broadcast.
To find the highest-frequency square wave that can be transmitted, one would need to consider the frequency spectrum of FM broadcast.
The frequency range for FM broadcast in the United States is typically between 88 MHz and 108 MHz. The highest frequency that can be transmitted would be half of the bandwidth, which is 10 MHz.
However, this frequency would not be a square wave but rather a sine wave.
To transmit a square wave, one would need to use multiple frequencies in order to approximate the square wave shape.
The exact frequencies used would depend on the specific implementation and requirements of the transmission.
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A rotary lawn mower uses a piece of light nylon string with a small metal sphere on the end to cut the grass. The string is 20 cm in length and the mass of the sphere is 30 g.
[i] Find the tension in the string when the sphere is rotating at 2000 rpm, assuming the string is horizontal.
(ii) Explain why it is reasonable to assume that the string is horizontal.
[iii] Find the speed of the sphere when the tension in the string is 80 N.
To find the tension in the string when the sphere is rotating at 2000 rpm, assuming the string is horizontal, we need to use the formula for tension: Tension (T) = (mass x velocity²)/radius ... (1).Therefore, the speed of the sphere when the tension in the string is 80 N is 24.494 m/s.
Thus, the tension in the string is 126.67 N when the sphere is rotating at 2000 rpm, assuming the string is horizontal.(ii) It is reasonable to assume that the string is horizontal because it will have zero vertical component of tension. This is because the string does not pull or support any vertical load. The tension in the string is only because of the centrifugal force acting on the metal sphere.
This force always acts away from the center of rotation and perpendicular to the radius of rotation. Therefore, we can assume that the string is horizontal.(iii) To find the speed of the sphere when the tension in the string is 80 N, we can rearrange equation (1) to get the velocity of the sphere. So, v = √((Tr)/m )Substituting the values: v = √((80 x 0.1)/0.03)= 24.494 m/s
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Consider the four scenarios below: - A 1,200-kg car driving at 15 m/s. - A 2,400-kg truck driving at 10 m/s. - An 800-kg motorcycle driving at 30 m/s. - A 200-kg go-kart driving at 200 m/s. Which of those options has the greatest momentum? Truck Go-Kart Motorcycle Car
The greatest momentum is The truck, the correct answer is Go-Kart.
Momentum (p) is the product of an object's mass (m) and velocity (v). A larger momentum indicates that an object is heavier or moving quickly.
To determine which object has the greatest momentum, we can utilize the formula:
p = mv.A 1,200-kg car driving at 15 m/s:
Momentum (p) = 1,200 kg × 15 m/s = 18,000 kg m/s.A 2,400-kg
truck driving at 10 m/s:
Momentum (p) = 2,400 kg × 10 m/s = 24,000 kg m/s.
An 800-kg motorcycle driving at 30 m/s:
Momentum (p) = 800 kg × 30 m/s = 24,000 kg m/s.
A 200-kg go-kart driving at 200 m/s:
Momentum (p) = 200 kg × 200 m/s = 40,000 kg m/s.
The go-kart with a mass of 200 kg and velocity of 200 m/s has the greatest momentum.
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continuous-time signal x() is expressed as x()={()−(−1)}.
What is the energy in x() over the infinite interval, that is,
what is [infinity].
The energy of [tex]x(t)[/tex] over an infinite interval is infinite.
The energy E of a continuous-time signal x(t) over a given interval [a, b] can be calculated using the following formula:
[tex]E = \int\ {a^b |x(t)|^2} \, dt[/tex] where [tex]|x(t)|[/tex] is the magnitude of [tex]x(t)[/tex].
In this question, we are given a continuous-time signal [tex]x(t)[/tex] as
[tex]x(t) = e^(^-^t^) - e^(^t^)[/tex]
We are asked to find the energy of [tex]x(t)[/tex] over the infinite interval, that is, what is [infinity].
We can use the same formula as above but with the limits of integration changed:
[tex]E = \int\ {0^i^n^f^i^n^i^t^y |x(t)|^2} \, dt[/tex]
= [tex]\int\ { 0^i^n^f^i^n^i^t^y (e^(^-^t^) - e^(^t^))^2} \, dt[/tex] = ∞
The energy of [tex]x(t)[/tex] over an infinite interval is infinite. This indicates that the power of [tex]x(t)[/tex] is also infinite. This is because power is energy per unit time, and we are integrating over an infinite time interval.
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A 13.0 μF capacitor is charged by a 10.0V battery through a resistance R. The capacitor reaches a potential difference of 4.00 V at a time 3.00 s after charging begins. Find R 117.7 x Your response d
The formula to calculate the voltage across a capacitor is given by:
[tex]V = Vf (1 - e^(-t/RC))[/tex].
where, V = Voltage across capacitor
Vf = Final voltage across capacitor
R = Resistance
C = Capacitance of the capacitor
t = time In the given problem, the resistance, R is to be calculated.
Using the given values, we can rearrange the formula to solve for
[tex]R.R = -t/(Cln((V - Vf)/Vf))[/tex]
On substituting the values, we get,
[tex]R = -3.00 s/(13.0 μF ln((10.0 V - 4.00 V)/4.00 V))= 117.7 Ω[/tex]
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Two point charges are located on the -axis of a coordinate system: q1 = 1.0 nC is at x = +2.0 cm, and q2 is at x = +4.0 cm. What is the total electric force exerted by q1 and q2 on a charge q3 = 5.0 nC at x = 0?
what is
F1-3
F2on3
F3
HELP ASAP
Two point charges are located on the x-axis of a coordinate system: ql = -15.0 nC is at x = 2.0 m, q2 = +20.0 nC is at x = 6.0 m, and q3 = 5.0 nC at x = 0. What is the net force experienced by q3? ?
reqd
F1on3
F2on3
F3
Given data;Charge of ql = -15.0 nC,Charge of q2 = +20.0 nCCharge of q3 = 5.0 nCDistance of ql from q3 = 2.0 mDistance of q2 from q3 = 6.0 m Distance of q3 from the axis = 0Net force experienced by q3 is calculated using Coulomb's law and vector addition principles.
Coulomb's law for electric force F on q3 between ql and
[tex]q3F1on3 = (1/4πε₀) (qlq3/r13²)[/tex]
where, r13 = 2 m (distance of ql from q3)
ε₀ is a constant having the value [tex]8.854 x 10^-12 C²/Nm²[/tex]
Putting the values, we get;
F1on3 = ([tex]1/4πε₀) (qlq3/r13²)[/tex]
=[tex](1/4πε₀) (-15.0 × 10^-9 C × 5.0 × 10^-9 C / 2.0²)[/tex]
= - 100.6 N
(force experienced by q3 due to ql)Coulomb's law for electric force F on q3 between q2 and q3F2on3 = [tex](1/4πε₀) (q2q3/r23²)[/tex]
where, r23 = 6 m (distance of q2 from q3)ε₀ is a constant having the value [tex]8.854 x 10^-12 C²/Nm²[/tex]
Putting the values, we get;
[tex]F2on3 = (1/4πε₀) (q2q3/r23²)[/tex]
=[tex](1/4πε₀) (+20.0 × 10^-9 C × 5.0 × 10^-9 C / 6.0²)[/tex]
= + 6.24 N (force experienced by q3 due to q2)The net force on q3 is;
F3 = F1on3 + F2on3
= - 100.6 N + 6.24 N
= - 94.36 N
The net force experienced by q3 is 94.36 N and it is directed towards ql.
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For each problem, draw a diagram showing the relevant physics of the problem, including any vectors. All relevant quantities should be clearly labeled on the diagram. Start from first principles (an equation in the review section of the chapters). Always show your work and/or explain your reasoning. In some cases, the work speaks for itself and requires little to no explanation. For problems with few or no calculations, but sure to clearly explain your reasoning. Answers without work shown or without sufficient relevant explanations will not receive full credit. Be sure to include units. Problem 4 Copper has a work function of 4.70 eV, a resistivity of 1.7 x10 m, and a temperature coefficient of 3.9 x10³ °C -¹. Suppose you have a cylindrical wire of length 2.0 m and diameter 0.50 cm connected to a variable power source; and a separate thin, square plate of copper. (a) (5 points) Draw a clear physics diagram showing each part of the problem. (b) (6 points) At what temperature would the wire have 5 times the resistance that it has at 20 ºC? (c) (3 points) Use Wien's Law (Eq 14-24) to find the peak wavelength of radiation emitted by a wire of this temperature. (d) (6 points) If light at only the wavelength found above were shone onto the copper plate, what would be the maximum kinetic energy of the ejected photoelectrons?
(b) The temperature is 1656°C. (c) The peak wavelength is 1.75 × 10−6 m.
(d) The maximum kinetic energy of the ejected photoelectrons is 2.56 × 10−20 J.
b) Given: Resistivity of copper, p = 1.7 × 10−8 Ω m
Temperature coefficient of resistivity, α = 3.9 × 10−3/°C Work function, W = 4.7 eV Length of the cylindrical wire, l = 2.0 m Diameter of the wire, d = 0.50 cm Temperature, T1 = 20 °C Temperature, T2 = ?
The resistance of the wire at a given temperature T is given by R = pl/A, where A is the cross-sectional area of the wire. Thus, the resistance of the wire at 20°C can be calculated as follows: R1 = pl1/ A1
The resistance of the wire at a temperature T can be written as R2 = pl2/A2, where l2 = l and A2 = πd2/4.
To find the temperature at which the wire has five times the resistance it has at 20°C, we can use the equation R2 = 5R1.
R2 = pl2/ A2 = 5R1 = 5pl1/ A1l2/ A2 = (5/ p)(A1/A2)l1 = (5/ p)(πd2/4)l1/A1l2 = (5/ p)(πd2/4)l1/A1= (5/ p)(π(0.005 m)2/4) (2.0 m)/(π(0.00025 m2)/4)l2 = 0.0049 l1= 0.0049 × 2 = 0.0098 mT2 = T1 + ΔTR2 = pl2/A2 = p(l1 + αΔT)(A2/ A1) = pl1(πd2/4)/(πd12/4) = pld2/d12 = 4pld2πd12T2 = T1 + ΔT = T1 + (R2/R1 − 1)/α = 20 + [(5pl1/ A1)/pl1 − 1]/α= 20 + [5(π(0.005 m)2/4)(2.0 m)/(π(0.00025 m2)/4)/(π(0.005 m)2/4) − 1]/(3.9 × 10−3/°C)= 1656 °C
c) Wien’s law states that the wavelength λ of the peak of the blackbody radiation spectrum is inversely proportional to the absolute temperature T of the object.
Mathematically, this can be expressed as λmaxT = b, where b is a constant equal to 2.898 × 10−3 m·K.
Thus, the peak wavelength of radiation emitted by a wire of temperature T is given by λmax = b/T.
Substituting the value of T obtained above, we get λmax = 1.75 × 10−6 m.
d) The maximum kinetic energy of the ejected photoelectrons is given by KE = hf − W, where h is Planck’s constant (6.626 × 10−34 J·s) and f is the frequency of the light.
To find the frequency of the light, we can use the equation λf = c, where c is the speed of light.
Thus, f = c/λmax = 1.712 × 1014 Hz.
Substituting the given value of the work function W and the frequency of the light obtained above, we get KE = hf − W = (6.626 × 10−34 J·s)(1.712 × 1014 Hz) − (4.7 eV)(1.602 × 10−19 J/eV) = 1.01 × 10−19 J - 7.53 × 10−20 J = 2.56 × 10−20 J.
Answer:
(b) The temperature is 1656°C. (c) The peak wavelength is 1.75 × 10−6 m.
(d) The maximum kinetic energy of the ejected photoelectrons is 2.56 × 10−20 J.
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