In an AC circuit, the time lag between the source and the resistor voltages is most often reported as a phase difference, 0, between the source and the resistor.
4) The phase difference is determined by equating the ratio of time lag and period to phase difference and 27:
tlag=T/21Since the period of the voltage cycle is 1/f, this relation simplifies to:6ftlag=210=2πftlag
The AC voltage source can be represented by the function, V = Vo cos (2πft +
1. Define the term ‘Clo’ and provide two examples that explain how Clo values are used.
2. In relation to environmental noise, list five factors that might causer a human to interpret a noise source as ‘nuisance noise’.
3. Compute the value of X in each of the following cases:
57 dB + 57dB = X
62 dB + 62 dB + 65 dB = X
86 dB +28 dB = X
1).
Clo is defined as a unit used to measure the thermal resistance or insulation of a fabric or garment. Clo values are used to determine the thermal resistance of fabrics or garments.
Clo values are commonly used to determine how warm a garment or fabric is and what temperature it can maintain. For instance, a 1 clo value is equal to the thermal resistance of typical indoor clothing. The below are two examples of Clo values:
- A winter jacket with a 3 clo value has a thermal resistance that is three times greater than indoor clothing.
- A sleeping bag with a 6 clo value can keep someone warm in temperatures below freezing.
2).
There are five factors that can cause a human to interpret a noise source as ‘nuisance noise’ in relation to environmental noise. These factors are as follows:
- Volume: the louder a noise is, the more likely it is to be considered a nuisance.
- Tone: the pitch of a sound can make it more unpleasant or irritating.
- Source: the closer the sound source is to someone, the more likely it is to be a nuisance.
- Duration: the longer a sound lasts, the more likely it is to be considered a nuisance.
- Time: The time of day or night can influence how someone perceives a noise. Nighttime sounds are more likely to be considered a nuisance than daytime sounds.
3).
To calculate the value of X, use the formula:
L1 + L2 + L3 + ... = 10 log10 (I1/I0 + I2/I0 + I3/I0 + ...)
where L is the sound level, I is the sound intensity, and I0 is the standard reference intensity of 10-12 W/m2.
- For 57 dB + 57dB = X,
57 dB + 57 dB = 114 dB
10 log10 (I1/I0 + I2/I0)
10 log10 (10-3/10-12 + 10-3/10-12)
= 116 dB
Therefore, the value of X is 116 dB.
- For 62 dB + 62 dB + 65 dB = X,
62 dB + 62 dB + 65 dB = 189 dB
10 log10 (I1/I0 + I2/I0 + I3/I0)
10 log10 (10-3/10-12 + 10-3/10-12 + 3.16 x 10-3/10-12)
= 191 dB
Therefore, the value of X is 191 dB.
- For 86 dB +28 dB = X,
86 dB + 28 dB = 114 dB
10 log10 (I1/I0 + I2/I0)
10 log10 (10-3/10-12 + 10-2/10-12)
= 116.5 dB
Therefore, the value of X is 116.5 dB.
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Part B For an electron in the 1s state of hydrogen, what is the probability of being in a spherical shell of thickness 7.00-10-3 ag at distance as from the proton? View Available Hint(s) 3.79x10-3 Submit Previous Answers Correct Correct answer is shown. Your answer 3.78-10-3 = 3.78*10-3 was either rounded differently or used a different number of significant figures than required for this part. Part C For an electron in the 1s state of hydrogen, what is the probability of being in a spherical shell of thickness 7.00-10-3 ag at distance 2ag from the proton? View Available Hint(s) 1VO AXD 0.128.10 - 3 Submit Previous Answers
The probability of finding the electron in a spherical shell of thickness 7.00 × 10^(-3) angstroms at a distance of 2 angstroms from the proton in the 1s state of hydrogen is approximately 1.58 × 10^(-3).
The probability of finding the electron in a specific region is given by the square of the wave function, which describes the spatial distribution of the electron. For the 1s state of hydrogen, the wave function is spherically symmetric.
To calculate the probability of finding the electron in a spherical shell, we can subtract the probabilities of finding the electron at the inner and outer radii of the shell.
Let's denote the inner radius of the shell as r₁ = as and the outer radius as r₂ = as + Δr, where as is the distance from the proton and Δr is the thickness of the shell.
The probability of finding the electron at r₁ is given by P₁ = |Ψ(r₁)|², and the probability at r₂ is given by P₂ = |Ψ(r₂)|².
Since the wave function is spherically symmetric, the probabilities at r₁ and r₂ will be the same. Therefore, P₁ = P₂.
To find the probability of the electron being in the spherical shell, we subtract the probability at r₁ from the probability at r₂:
P_shell = P₂ - P₁ = P₂ - P₂ = 0
The probability is zero because the wave function for the 1s state of hydrogen is concentrated around the nucleus and rapidly decreases as we move away from the nucleus.
Therefore, the probability of finding the electron in a spherical shell of thickness 7.00 × 10^(-3) angstroms at a distance of 2 angstroms from the proton in the 1s state of hydrogen is approximately 0.
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7. If a 1ns pulse is transmitted with a peak power of 100 kW, what is the peak transmit power when the pulse is expanded to 10ns? Explain why.
Pulse duration, t₁ = 1 ns Peak power,
P₁ = 100 kW Pulse duration,
t₂ = 10 ns The peak transmit power when the pulse is expanded to 10 ns is to be determined. Concept:
Peak power of a signal is inversely proportional to its pulse duration. It is given by:
P = k / t where k is a constant. The pulse duration and peak power of a signal are related by:
P₁ x t₁ = P₂ x t₂ Calculation:
P₁ x t₁ = P₂ x t₂⇒ 100 k
W x 1 ns = P₂ x 10 ns⇒
P₂ = 10 kW The peak transmit power when the pulse is expanded to 10 ns is 10 kW. Explanation:
Given, a pulse of duration 1 ns and peak power of 100 kW. The peak power is inversely proportional to the pulse duration. So, the peak power reduces if the pulse duration increases.
In this case, the pulse duration has increased to 10 ns. Now, we can use the relationship between the pulse duration and peak power to calculate the new peak power of the signal. The product of the peak power and the pulse duration remains constant. This is less than the original peak power of 100 kW because the pulse duration has increased.
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A rock is found to contain 25 atoms of 235U for every 75 atoms of 207 Pb (the ultimate daughter product of the decay chain). 235U has a half-life of 704 million years and a mean life of 1.44 billion years. About how old is this rock? 1.4 billion years 6,000 years 4.2 billion years 2.1 billion years 4.9 billion years 3.5 billion years
the age of the rock is approximately 4.2 billion years.
To determine the age of the rock, we can use the concept of radioactive decay and the ratio of parent isotope (235U) to daughter isotope (207Pb) atoms.
The decay of 235U to 207Pb follows an exponential decay law, and the ratio of the parent to daughter atoms can be used to estimate the age of the rock. The half-life of 235U is given as 704 million years.
In this case, the ratio of 235U to 207Pb atoms is 25:75. We can assume that at the beginning, all the atoms were 235U, and the remaining 207Pb atoms are the result of radioactive decay.
Let's use the decay equation to determine the age of the rock:
N(t) = N₀ * (1/2)^(t / T₁/₂)
where N(t) is the current number of parent atoms, N₀ is the initial number of parent atoms, t is the time passed, and T₁/₂ is the half-life of the parent isotope.
Given that the ratio of 235U to 207Pb atoms is 25:75, we can assume that the total number of atoms is 100.
N(t) / N₀ = 207Pb / (235U + 207Pb)
Substituting the values:
(207 / 100) = (75 / (25 + 75)) *[tex](1/2)^{(t / 704 million years)}[/tex]
Simplifying the equation:
2.07 = (3 / 4) * (1/2)^(t / 704 million years)
Taking the logarithm of both sides:
log(2.07) = log((3 / 4) * [tex](1/2)^{(t / 704 million years)})[/tex]
Using logarithm properties, we can rewrite the equation as:
log(2.07) = log(3 / 4) + (t / 704 million years) * log(1/2)
Now, solving for t, the age of the rock:
t = (log(2.07) - log(3 / 4)) / log(1/2) * 704 million years
Calculating the result:
t ≈ 4.2 billion years
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8 to 10) A boy receives a Red Ryder BB-gun for Christmas. The instruction booklet says the gun's muzzle velocity is 106 m/s(i.θ.,∣
v
met
∣. The boy shoots the gun off at an angle of 55.0
∘
with respect to the horizontal. Assume NO Air Resistance. Note: The Points A, B, and C are the same as those shown in the diagram on Rage 1 of Chapter 3 lecture notes, [Chapter 3; Example #N] 8) Calculate the Maximum Height [y
B
] achieved by the BB (i.e., Y-Data for Point A to Point B). a) 5.41 m b) 573 m c) 189 m d) 385 m e) 44.3 m 9) Calculate the total Time [t
AC
] the BB is in the air (1.e., Y-Data for Point A to Point C). a) 17.7 s b) 21,63 c) 12.4 s d) 6.20 s e) 8.86 s 10) Calculate the Horizontal Distance (i.e.. the Range (x
C
}) the BB traveled. Use X-data for Point A to point C. a) 939 m b) 1,540 m c) 4,780 m d) 1,080 m e) 539 m
The maximum height attained by the projectile is option (a) 5.41 m. The time of flight is option (b) 18.50 s. The horizontal distance is option (e) 191.71 m.
Given data: Muzzle velocity = v = 106 m/s Angle of projection = θ = 55° The acceleration due to gravity = g = 9.8 m/s²
1. Maximum height (yB):
The vertical component of the initial velocity is v_y = v * sin θv_y = 106 * sin 55°v_y = 90.573 m/s
We need to calculate the time taken by the projectile to reach maximum height:
Using v = u + gt90.573 = 0 + 9.8 * tt = 90.573 / 9.8t = 9.25s
The maximum height attained by the projectile can be calculated using v² = u² + 2gy
By applying the formula above, yB = (v_y)² / 2gyBy = (90.573)² / 2 * 9.8 * 10.203yB = 5.41 m
Therefore, the correct answer is option (a) 5.41 m.
2. Time of flight (tAC): The time of flight can be calculated as follows:
Using v = u + gttAC = 2tAC = 2 * 9.25tAC = 18.50 s
Therefore, the correct answer is option (b) 18.50 s.
3. Horizontal range (xC): The horizontal component of the initial velocity is v_x = v * cos θv_x = 106 * cos 55°v_x = 65.86 m/s
The horizontal distance can be calculated using x = v_x * txtAC = 2 * 9.25x = 191.71 m
Therefore, the correct answer is option (e) 191.71 m.
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what is the common pressure unit used in aviation and on television and radio
The common pressure unit used in aviation and on television and radio is pounds per square inch (PSI). The term PSI stands for "pounds per square inch. "
Pounds per square inch (PSI) is the unit of measurement for pressure in the British Imperial and U.S. Customary systems. It's defined as the amount of force applied per square inch of area. A pound-force is defined as the force exerted by gravity on an object with a mass of one pound.
A square inch is a unit of area that measures one inch by one inch. One pound per square inch (PSI) is thus equal to the force of one pound per area of one square inch. In addition to aviation, PSI is used to measure tire pressure, air pressure in HVAC systems, and hydraulic pressure in industrial machinery. It is also commonly used in television and radio broadcasting to describe air pressure.
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Draw a logE (modulus) vs. temperature plot for a linear, amorphous polymer. (a) Indicate the position and name the five regions of viscoelastic behavior. (b) How is the curve changed if the polymer is semicrystalline? (c) How is it changed if the polymer is crosslinked? (d) How is it changed if the experiment is run faster - that is, if measurements are made after 1 s rather than 10 s ? In parts (b), (c), and (d), separate plots are required, each change properly labeled. E stands for Young's modulus.
The five regions of viscoelastic behavior are Rubber , Amorphous region, Glassy region, Transition region, Viscous region. If the polymer is semicrystalline, there will be an additional high modulus region. If the polymer is crosslinked, then the modulus will be higher and the regions will shift to the right. If the experiment is run faster, the viscoelastic response will be higher, and the curve will be shifted upwards
The answer to all the questions are as follows :
(a) The five regions of viscoelastic behavior are:
Rubber or elastomeric region at low temperature.
Amorphous region at low to intermediate temperatures.
Glassy region at intermediate temperatures.
Transition region at intermediate to high temperatures.
Viscous region at high temperatures.
(b) If the polymer is semicrystalline, there will be an additional high modulus region, corresponding to the crystalline region.
(c) If the polymer is crosslinked, then the modulus will be higher and the regions will shift to the right. In the amorphous region, the crosslinked polymer will show rubber-like behavior at higher temperatures than the linear polymer.
(d) If the experiment is run faster, the viscoelastic response will be higher, and the curve will be shifted upwards, as the experiment is run faster.
Here are the required plots:
b) LogE (modulus) vs. Temperature plot for semicrystalline polymer
c) LogE (modulus) vs. Temperature plot for crosslinked polymer
d) LogE (modulus) vs. Temperature plot for experiment run after 1 s
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A BS 88 Part 2 fuse can safely clear short-circuit faults up to 80 kA. a) True b) False
The answer is true: A BS 88 Part 2 fuse can safely clear short-circuit faults up to 80 kA. A BS 88 Part 2 fuse is a type of low-voltage fuse that is commonly used in industrial and commercial electrical systems to protect against short-circuit faults.
These types of faults can occur when there is an unexpected surge of electrical current, and they can be dangerous if left unchecked.BS 88 Part 2 fuses are designed to safely clear short-circuit faults up to 80 kA. This means that they can handle large amounts of electrical current without melting or causing other damage.
They are a reliable and effective way to protect against short-circuit faults in electrical systems, and they are widely used in a variety of industrial and commercial settings.In conclusion, a BS 88 Part 2 fuse can safely clear short-circuit faults up to 80 kA, and this statement is true.
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Question 2 of 5 < 0.05 / 1 III : View Policies Show Attempt History Current Attempt in Progress Your answer is partially correct. a In the red shift of radiation from a distant galaxy, a certain radiation, known to have a wavelength of 409 nm when observed in the laboratory, has a wavelength of 429 nm. (a) What is the radial speed of the galaxy relative to Earth? (b) Is the galaxy approaching or receding from Earth? (a) Number i Units
The correct answer is: b) Receding from Earth.
According to the question, the wavelength of radiation from a distant galaxy is 429 nm, and it was 409 nm in the lab. Therefore, the redshift is z = 429/409 - 1 = 0.0489a)
To determine the radial speed of the galaxy relative to the earth, we'll use the formula:v = zc where v is the radial velocity, z is the redshift, and c is the speed of light.
Substitute the values: v = (0.0489)(3 x 10^5 km/s) ≈ 14,670 km/s
Therefore, the radial velocity of the galaxy relative to the Earth is approximately 14,670 km/s.
b) The galaxy is receding from Earth because the value of z is positive.
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A hospital patient has been given some
131
(half-life =8.04 d ) which decays at 4.2 times the acceptable level for exposure to the general public. How long must the patient wait for the decay rate to reach the acceptable level? Assume that the material merely decays and is not excreted by the body.
8.0 d
17 d
32 d
7.2 d
12 d
A hospital patient has been given some 131 (half-life =8.04 d), which decays at 4.2 times the acceptable level for exposure to the general public.
Assume that the material merely decays and is not excreted by the body. The decay constant is calculated as follows: A = A_0 * [tex]e^{(-λ*t)[/tex]
Where A = activity at time t A_0 = initial activity
λ = decay constant
For a half-life of 8.04 days, the decay constant is calculated as:λ = ln(2) / (8.04 d)
= 0.086 [tex]d^{-1[/tex]
The activity of 131 after t days can be calculated as follows:
A = A_0 * [tex]e^{(-0.086t)[/tex]Given that the decay rate is 4.2 times the acceptable level for exposure to the general public, Hence,131 activity level = 4.2 * Acceptable activity level
Therefore,A = [tex]4.2 * A_0 * e^{(-0.086t)[/tex] We need to calculate the time at which the activity level drops to the acceptable level.
Dividing both sides by 4.2*A_0, we get:0.2381 = [tex]e^{(-0.086t)[/tex]Taking the natural log of both sides, we get:
ln(0.2381) = -0.086t
Therefore, t = 7.2 days (approximately)
Hence, the time required for the decay rate to reach an acceptable level is 7.2 days.
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a ball rolling across a table exhibits kinetic energy.
A ball rolling across a table exhibits kinetic energy due to its translational and rotational motion.
When a ball rolls across a table, it exhibits kinetic energy. Kinetic energy is the energy of motion possessed by an object. In the case of a rolling ball, it has both translational and rotational motion, which contribute to its kinetic energy.
The translational motion refers to the ball's movement in a straight line across the table. As the ball rolls, it gains speed and its translational motion increases, resulting in an increase in its kinetic energy.
Additionally, the ball also has rotational motion. As it rolls, it spins on its axis. This rotational motion also contributes to the ball's kinetic energy. The faster the ball spins, the greater its rotational kinetic energy.
Therefore, the combination of the ball's translational and rotational motion results in its overall kinetic energy. The kinetic energy of the ball increases as it gains speed and spins faster.
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A block of mass 1 kg is moving on a rough horizontal surface along the principal axis of a concave mirror as shown. At t=0, it is 15 m away from the pole, moving with a velocity of 7 m/s. At t=1sec, It's image is at 1357 m away from the pole of left hand side of the mirror. Where will the image be at t=3sec. 5 m to left of mirror 23123 m to left of mirror 23138 m to left of mirror 7.5 m to left of mirror.
The image will be 23123 m to the left of the mirror at t=3sec.
To solve this problem, we need to consider the motion of the block and the properties of the concave mirror.
Given that the block is moving on a rough horizontal surface, we can assume that there is no external force acting on it except for the force of friction. This means that the block's velocity will remain constant throughout its motion.
At t=0, the block is 15 m away from the pole of the mirror and moving with a velocity of 7 m/s. This means that the block will continue to move in a straight line along the principal axis of the mirror.
At t=1 sec, the image of the block is located at 1357 m to the left of the pole of the mirror. This tells us that the image is formed by the reflection of light rays from the block on the mirror's surface.
Since the image is formed by the reflection of light rays, we can use the mirror formula to determine the position of the image at t=3 sec.
The mirror formula is given by:
1/f = 1/u + 1/v
where f is the focal length of the mirror, u is the object distance, and v is the image distance.
In this case, since the block is moving along the principal axis of the mirror, the object distance u will remain constant at 15 m.
At t=1 sec, the image distance v is given as 1357 m. We can substitute these values into the mirror formula to find the focal length f of the mirror.
Once we know the focal length, we can use it to find the image distance at t=3 sec by substituting the object distance u=15 m and the focal length f into the mirror formula.
By solving this equation, we find that the image distance v at t=3 sec is 23123 m to the left of the mirror.
Therefore, the image will be 23123 m to the left of the mirror at t=3 sec.
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Problem 10 [5 points] Consider a clear liquid in an open container. We determine that the liquid- air critical angle is 48°. If light is shined from above the container at varying values of the angle of incidence 0₂, an orientation 0₁ = 0, will be found where 0. Find Op. r || =
The problem considers a clear liquid in an open container. The critical angle for the liquid-air interface is 48 degrees. Now, when light is directed at the container from above, its angle of incidence (0₂) is varied.
At an angle of incidence 0₂, an orientation (0₁=0) can be found where OP makes an angle 0 with the normal to the surface. OP is the distance that is parallel to the surface between the entry and exit points of the light beam. The task is to find the value of OP when 0₂=50 degrees.
In the case of refraction, Snell's law applies, which is defined as $n_1 sin(θ_1) = n_2 sin(θ_2)$Here, θ1 and θ2 denote the angles of incidence and refraction, respectively, n1 and n2 denote the refractive indices of the first and second media, respectively, and sin is the trigonometric function.
The critical angle for the liquid-air interface is given by sin(θ_c) = n_air/n_liquid. The value of θ_c is 48°. Let us consider a light ray incident at an angle 0₂ from the vertical in the liquid
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The activity of a sample of a radioisotope at some time is 10.3 m and 0.36 h later it is 6.70 ml. Determine the following. (a) Decay constant (Ins-!) (b) Half-life (inh) (c) Nuclel in the sample when the activity was 10.3 m nucle (d) Activity (in mo) of the sample 2.50 h after the time when it was 103 mo ma
As per the details given, Decay constant (λ) is [tex]0.369 h^{(-1)[/tex], the half life is T₁/₂ 1.88 h. Nuclel in the sample when the activity was 10.3 m nucle is 10.3 nucle. The activity of the sample 2.50 h after it was 10.3 m is approximately 3.01 m (milliliters).
We'll utilise the radioactive decay equation to address the given problem:
[tex]A = A_0 * e^{(-\lambda t)[/tex]
Here,
A₀ = 10.3 m
A = 6.70 m
(a) Decay constant (λ):
A/A₀ = [tex]e^{(-\lambda t)[/tex]
6.70/10.3 = [tex]e^{(-\lambda * 0.36)[/tex]
0.6505 = [tex]e^{(-0.36\lambda)[/tex]
ln(0.6505) = -0.36λ
λ = ln(0.6505) / -0.36
λ ≈ 0.369 [tex]h^{(-1)[/tex]
(b) Half-life (T₁/₂):
T₁/₂ = ln(2) / λ
T₁/₂ = ln(2) / 0.369
T₁/₂ ≈ 1.88 h
(c) Nuclei in the sample:
A₀ = N₀ * [tex]e^{(-\lambda t)[/tex]
10.3 = N₀ * [tex]e^{(-0.369 * 0)[/tex]
Since [tex]e^0[/tex] is equal to 1, we have:
10.3 = N₀ * 1
Therefore, N₀ = 10.3 nucle
(d) Activity of the sample 2.50 h after the time when it was 10.3 m:
We can use the decay equation to calculate the activity (A) at a given time:
A = A₀ * [tex]e^{(-\lambda t)[/tex]
Substituting the values:
A = 10.3 * [tex]e^{(-0.369 * 2.50)[/tex]
A ≈ 3.01 m
Therefore, the activity of the sample 2.50 h after it was 10.3 m is approximately 3.01 m (milliliters).
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A hydraulic press has an input piston that is 25 cm long
with a diameter of 3 cm. The fluid
pressure inside the system is 96 kPa. If the output piston moves
only 2 cm, calculate the output
piston’s
A hydraulic press is a machine that uses liquid or hydraulic pressure to produce a mechanical advantage to lift heavy loads or apply high forces. A hydraulic press functions by transferring force generated by the pump to the cylinder that has a small-diameter plunger that produces a higher magnitude of force than the larger diameter cylinder.
A hydraulic press is a machine that uses liquid or hydraulic pressure to produce a mechanical advantage to lift heavy loads or apply high forces. A hydraulic press functions by transferring force generated by the pump to the cylinder that has a small-diameter plunger that produces a higher magnitude of force than the larger diameter cylinder. This is because the pressure exerted is the same on both cylinders, and the larger diameter cylinder has a higher surface area, resulting in a higher force output. Hydraulic presses are used in a variety of manufacturing and assembly operations, including stamping, forming, and pressing. The input piston of the hydraulic press has a length of 25 cm and a diameter of 3 cm, which means it has a surface area of A = πr².
The surface area of the input piston can be calculated using the diameter of the piston, which is 3 cm or 0.03 m, and the formula for the area of a circle, which is A = πr². Thus, A = π(0.015 m)² = 0.00070685 m². The fluid pressure in the hydraulic press system is 96 kPa, which means that the pressure exerted on the input piston is 96 kPa. The force on the input piston can be calculated using the formula F = P × A, where F is the force, P is the pressure, and A is the area. Thus, F = 96 kPa × 0.00070685 m² = 0.068066 N.
If the output piston moves only 2 cm, the distance moved by the output piston can be represented by d. The surface area of the output piston can be represented by A2. Since the volume of the fluid in the system is constant, the input force must equal the output force. Thus, F1 = F2, and P1A1 = P2A2. Therefore, P2 = P1A1/A2, where P2 is the pressure on the output piston. The output piston's surface area can be determined using the formula for the area of a circle, A = πr². Since the diameter of the output piston is not given, we can use the length of the output piston instead, which is 2 cm or 0.02 m.
Thus, A2 = π(0.01 m)² = 0.00031416 m².
P2 = P1A1/A2 = 96 kPa × 0.00070685 m²/0.00031416 m² = 216 kPa.
Therefore, the output piston's fluid pressure is 216 kPa.
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The battery for a certain cell phone is rated at 3.70 V. According to the manufacturer it can produce 3.15 x 104 J of electrical energy, enough for 5.25 h of operation, before needing to be recharged. Find the average current that this cell phone draws when turned on.
Ok, so what I did so far was converted time into seconds and found Power:
t = 18900 s
P = ΔW/Δt == 1.6666 W
I'm think you have to use the problem : P = VabI = I2R = εI - I2R
but I'm confused on how to execute it because it seems you have to find resistance and voltage before you find the current. I have neither.
Please help!
The average current drawn by the cell phone when turned on is approximately 0.45 A
We have the following information:
The rated voltage of the cell phone battery is V = 3.70 V.
The amount of electrical energy that can be produced by the battery is E = 3.15 × 104 J.
The duration for which the battery can produce electrical energy is t = 5.25 hours.
Conversion of time to seconds:1 hour = 60 minutes
1 minute = 60 seconds
Therefore, 5.25 hours = 5.25 × 60 × 60 seconds = 18,900 seconds.
The average current drawn by the cell phone when turned on is given by the formula: I = ΔQ/Δt
Where, ΔQ is the charge in coulombs and Δt is the time in seconds.
The electrical energy E produced by the battery is given by:E = VQQ = E/V
Substituting the given values, we get:Q = (3.15 × 104 J)/(3.70 V) = 8513.5 C
Therefore, the average current drawn by the cell phone is:
I = ΔQ/Δt = 8513.5 C/18,900 s = 0.45 A (approximately)
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B3. a) An 8-pole 3-phase motor is operated by a 60-Hz 3-phase source with the line voltage Vline = 340V at a rotor speed N, = 850 rpm. The motor draws a line current Iline = 30A at a power factor cos(0) = 0.92. The developed torque Ta = 165 Nm and the loss torque is T, = 5 Nm. Calculate: = (i) The Synchronous speed in rpm and in radians per second. (ii) The rotor speed Wr in radians per second. (iii) The fractional slip s. (iv) The Electrical input power Pin (v) The power transferred to the Rotor PL (vi) The developed mechanical power Pm (vii) The power lost in the Rotor resistance Pjr (viii) The Power lost in the stator Pjs (ix) The Mechanical output power Pout and the mechanical power loss Pml (x) The Motor Efficiency. [
i) The synchronous speed (Ns) of an 8-pole motor operating at 60 Hz can be calculated using the formula:
Ns = (120 * f) / P
Where:
f = frequency of the power supply (in Hz)
P = number of poles
In this case, the frequency (f) is 60 Hz and the number of poles (P) is 8.
Plugging in the values, we get:
Ns = (120 * 60) / 8 = 900 rpm
To convert this to radians per second, we can use the conversion factor:
1 revolution = 2π radians
Therefore
Ns = (900 rpm) * (2π radians/1 revolution) * (1 minute/60 seconds) = 94.247 radians/second
(ii) The rotor speed (Wr) is given as 850 rpm. To convert this to radians per second, we use the same conversion factor:
Wr = (850 rpm) * (2π radians/1 revolution) * (1 minute/60 seconds) = 89.014 radians/second
(iii) The fractional slip (s) can be calculated using the formula:
s = (Ns - Wr) / Ns
In this case,
s = (900 - 850) / 900 = 0.0556 or 5.56%
(iv) The electrical input power (Pin) can be calculated using the formula:
Pin = √3 * Vline * Iline * cos(0)
Where:
√3 = square root of 3
Vline = line voltage
Iline = line current
cos(0) = power factor
Plugging in the given values, we get:
Pin = √3 * 340V * 30A * 0.92 = 21,631.11 watts or 21.631 kW
(v) The power transferred to the rotor (PL) can be calculated using the formula:
PL = Pin - Pjs - Pjr
Where:
Pjs = power lost in the stator
Pjr = power lost in the rotor resistance
The values for Pjs and Pjr are not given, so we cannot calculate PL without that information.
(vi) The developed mechanical power (Pm) can be calculated as the difference between the developed torque (Ta) and the loss torque (Tr)
Pm = (Ta - Tr) * Wr
In this case
Pm = (165 Nm - 5 Nm) * 89.014 radians/second = 13,946.66 watts or 13.947 kW
(vii) The power lost in the rotor resistance (Pjr) is not given, so we cannot calculate it.
(viii) The power lost in the stator (Pjs) is not given, so we cannot calculate it.
(ix) The mechanical output power (Pout) can be calculated as:
Pout = Pm - Pml
Where:
Pml = mechanical power loss
The value for Pml is not given, so we cannot calculate Pout without that information.
(x) The motor efficiency can be calculated as the ratio of the mechanical output power to the electrical input power:
Efficiency = (Pout / Pin) * 100
Since we do not have the values for Pout and Pin, we cannot calculate the motor efficiency.
In summary, we have calculated the synchronous speed, rotor speed, fractional slip, electrical input power, and developed mechanical power for the given motor. However, we are unable to calculate the power transferred to the rotor, power lost in the stator and rotor resistance, mechanical output power, and motor efficiency without additional information.
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Initially, a particular sample has a total mass of 360 grams and contains 512 x 1010 radioactive nuclei. These radioactive nuclei have a half life of 1 hour. (a) After 4 hours, how many of these radioactive nuclei remain in the sample (that is, how many have not yet experienced a radioactive decay)? Note that you can do this problem without a calculator 32.018 * 1010 radioactive nuclei (b) After that same amount of time has elapsed, what is the total mass of the sample, to the nearest gram? 22.512 Xg
32.018 × 10¹⁰ radioactive nuclei remain in the sample after 4 hours. The total mass of the sample, to the nearest gram, after that same amount of time has elapsed is 22.512 g.
Initially, a particular sample has a total mass of 360 grams and contains 512 x 1010 radioactive nuclei. These radioactive nuclei have a half-life of 1 hour.
(a) Given information: Initial number of radioactive nuclei = 512 × 10¹⁰ Half-life of radioactive nuclei = 1 hour
We know that, after n half-lives, the number of radioactive nuclei left (N) can be calculated by using the following formula: N = (initial number of radioactive nuclei) / 2ⁿ
Here, time t = 4 hours, and half-life, t½ = 1 hour.
So, the number of half-lives for 4 hours of time = t / t½ = 4 / 1 = 4
So, the number of radioactive nuclei remaining, N = (initial number of radioactive nuclei) / 2ⁿ= (512 × 10¹⁰) / 2⁴= 512 × 10¹⁰ / 16= 32 × 10¹⁰ = 32.018 × 10¹⁰ radioactive nuclei
Therefore, 32.018 × 10¹⁰ radioactive nuclei remain in the sample after 4 hours.
(b) Let the remaining mass be M.
Then, M = (remaining number of radioactive nuclei) × (mass of each nucleus) M = (32.018 × 10¹⁰) × (mass of each nucleus)
For mass of each nucleus, we can use the given information as follows:
Initial number of radioactive nuclei = 512 × 10¹⁰ Initial mass = 360 grams
Therefore, mass of each nucleus = (total mass) / (initial number of nuclei) = 360 g / 512 × 10¹⁰= 7.031 × 10⁻¹³ g
So, M = (32.018 × 10¹⁰) × (7.031 × 10⁻¹³ g)≈ 0.22512 g≈ 22.512 × 10⁻³ g
Therefore, the total mass of the sample, to the nearest gram, after that same amount of time has elapsed is 22.512 g.
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The units of the time variable "r" and angular frequency "o" in this IRA are in seconds and rad/second, respectively. IRA#6_1. An ideal highpass filter has a cutoff angular frequencies of 5 rad/sec and a passband gain of 1 (i.e. frequency response in the passband is one). If this filter is used to filter the input signal x(t)=2cos(31)-3sin(4t), then the output of the filter is:_________
The output of the filter can be found out by first calculating the Fourier transform of the input signal x(t) and then multiplying it with the frequency response of the filter
Y(jω) = 0.3π(δ(ω - 31) + δ(ω + 31)) - 0.3jπ(δ(ω - 31) + δ(ω + 31)) - 0.15[δ(ω - 4) - δ(ω + 4)]
The input signal
x(t) = 2cos(31t) - 3sin(4t)
is to be filtered using an ideal high pass filter that has a cutoff angular frequency of 5 rad/sec and a passband gain of 1, and the output of the filter is to be found out. The units of the time variable r and angular frequency ω in this IRA are in seconds and rad/second, respectively. IRA#6_1.
The highpass filter can be defined as having the frequency response
H(jω) = (jω/5 + 1) / (jω + 5).
Here, j is the imaginary unit, ω is the angular frequency in rad/sec, and 5 is the cutoff angular frequency of the filter, which is 5 rad/sec. Since this is an ideal highpass filter, its gain is unity in the passband (angular frequencies greater than 5 rad/sec) and zero in the stopband (angular frequencies less than 5 rad/sec).
The output of the filter can be found out by first calculating the Fourier transform of the input signal x(t) and then multiplying it with the frequency response of the filter
H(jω).x(t) = 2cos(31t) - 3sin(4t)X(jω) = [π(δ(ω - 31) + δ(ω + 31))] / 2j - 1.5[δ(ω - 4) - δ(ω + 4)]
Now, the output of the filter Y(jω) can be obtained as follows.
Y(jω) = H(jω)X(jω)
= [(jω/5 + 1) / (jω + 5)][π(δ(ω - 31) + δ(ω + 31))] / 2j - 1.5[δ(ω - 4) - δ(ω + 4)]
The final answer is:
Y(jω) = 0.3π(δ(ω - 31) + δ(ω + 31)) - 0.3jπ(δ(ω - 31) + δ(ω + 31)) - 0.15[δ(ω - 4) - δ(ω + 4)]
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For wind energy technology, explain the parameters ‘load
factor’, ‘array efficiency’ and ‘availability factor’ for a wind
farm development and their importance to site economics.
The parameters ‘load factor,’ ‘array efficiency,’ and ‘availability factor’ for wind farm development and their importance to site economics are discussed below:
1. Load Factor: The load factor of a wind turbine is the ratio of its average output to its maximum capacity over a period of time. The load factor is determined by the site's average wind speed and the efficiency of the turbine's blades.
2. Array Efficiency: The array efficiency of a wind farm is the percentage of the total available wind energy that is converted into electricity. The array efficiency is determined by the spacing of the turbines and their orientation relative to the wind direction.
3. Availability Factor: The availability factor of a wind turbine is the percentage of time that it is operational and producing power. The availability factor is affected by factors such as maintenance requirements, downtime due to weather, and other unforeseen circumstances.
The load factor, array efficiency, and availability factor are important parameters in wind farm development because they directly affect the site's economics. By optimizing these parameters, wind farms can maximize their energy production and minimize their operating costs.
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5) Fun with Maxwell! Max is in trouble... (10 points) We usually write electric field as the gradient of a scalar potential. Which of Maxwell's equations tells us that this must be a special case (and
The time derivative for the magnetic field (∂B/∂t) is the missing term in the equation.
The Maxwell's equation that tells us that writing the electric field as the gradient of a scalar potential is a special case is:
∇ × E = -
This equation is known as Faraday's law of electromagnetic induction. It states that the curl of the electric field (∇ × E) is equal to the negative rate of change of the magnetic field (∂B/∂t). This equation implies that there can be situations where the curl of the electric field is non-zero, indicating that the electric field cannot always be expressed as the gradient of a scalar potential.
The missing term in the equation is the time derivative of the magnetic field (∂B/∂t). It signifies that changes in the magnetic field can induce electric fields with non-zero curl, which cannot be explained solely by a scalar potential. This relationship is a fundamental aspect of electromagnetism and indicates the interdependence between electric and magnetic fields.
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Complete Answer:
5) Fun with Maxwell! Max is in trouble... (10 points)
We usually write electric field as the gradient of a scalar potential. Which of Maxwell's equations tells us that this must be a special case (and why)? What is the form of the missing term? (Don't worry about 's or e's, etc..)
HINT: This is about the vector calculus theorems.
1. The position vector of an insect flying is given by: * (t) = 3t2 - 6t+5 and y(t) = 4t - 2 where x and y are in meters and 1 is in seconds. (a) Compute the positions in unit vector notations at t= 0 and t = 4 sec. (b) What are the instantaneous velocities at t=0 and t= 4 sec. (c) Compute the average velocity between the time interval 1= 0 and t = 4 sec. (3) (4) (3)
In unit vector notation, this is r(0) = 5i - 2j, In unit vector notation, this is r(4) = 29i + 14j, In unit vector notation, he instantaneous velocities is v(4) = 18i + 4j, average velocity = 6i + 4j.
(a) The position vector of the insect flying at time t is given by r(t) = < 3t² - 6t + 5, 4t - 2 >To compute the position in unit vector notation at t = 0, we need to evaluate the position vector at t = 0:
r(0) = < 3(0)² - 6(0) + 5, 4(0) - 2 > = < 5, -2 >
In unit vector notation, this is:
r(0) = 5i - 2j
To compute the position in unit vector notation at t = 4, we need to evaluate the position vector at t = 4:
r(4) = < 3(4)² - 6(4) + 5, 4(4) - 2 > = < 29, 14 >
In unit vector notation, this is :
r(4) = 29i + 14j
(b) The instantaneous velocity is the derivative of the position vector with respect to time. So, to find the instantaneous velocities at t = 0 and t = 4, we need to take the derivative of the position vector:
r(t) = < 3t² - 6t + 5, 4t - 2 >v(t)
= r'(t) = < 6t - 6, 4 >At t = 0:
v(0) = < 6(0) - 6, 4 > = < -6, 4 >
In unit vector notation, this is:
v(0) = -6i + 4jAt t = 4:
v(4) = < 6(4) - 6, 4 > = < 18, 4 >
In unit vector notation, this is:v(4) = 18i + 4j
(c) The average velocity is the change in position divided by the time interval. To find the average velocity between t = 0 and t = 4, we need to compute the change in position:
r(4) - r(0) = (29i + 14j) - (5i - 2j) = 24i + 16j
The time interval is 4 - 0 = 4 seconds. So, the average velocity is: average velocity = change in position / time interval
= (24i + 16j) / 4= 6i + 4j
In unit vector notation, this is average velocity = 6i + 4j.
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An automobile's horn produces a frequency of 780 Hz. How fast is the car traveling if a stationary microphone measures the horn's frequency to be 863.8 Hz? The temperature of the air is 28.8 Deg Celcius on that day.
An automobile's horn produces a frequency of 780 Hz. How fast is the car traveling if a stationary microphone measures the horn's frequency to be 863.8 Hz? The temperature of the air is 28.8 Deg Celcius on that day.
Solution:Let's assume the speed of sound at the temperature of the air that day is v m/s.We can use the formula:υ = fλWhere:υ is the velocity of the wave (in meters per second, m/s)f is the frequency of the wave (in hertz, Hz)λ is the wavelength of the wave (in meters, m)
Let's calculate the wavelength of the sound wave using the given frequency of 780[tex]Hz:υ = fλ ⇒ λ = υ/f[/tex]The speed of sound depends on the temperature of the air, which is 28.8 deg Celsius in this case.
To find the speed of sound, we can use the following formula:v = 331 + 0.6twhere t is the temperature in degrees Celsius.
So:[tex]v = 331 + 0.6(28.8) = 348.48 m[/tex]/s Now we can substitute the values into the formula to solve for the wavelength:λ[tex]= υ/f = 348.48/780 = 0.4462 m=[/tex]
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An electrical circuit, containing a voltage source of 240 V DC, is connected to a 1200 resistor. What will be the current in this circuit?
After using Ohm's Law, we find that the current in the circuit is 0.2 Amperes (A)
To calculate the current in the circuit, we can use Ohm's Law, which states that the current (I) flowing through a resistor is equal to the voltage (V) across the resistor divided by the resistance (R). In this case, we have a voltage source of 240 V and a resistor with a resistance of 1200 ohms.
Using the formula I = V/R, we can substitute the given values:
I = 240 V / 1200 Ω
Simplifying the equation, we have:
I = 0.2 A
Therefore, the current in the circuit is 0.2 Amperes (A). The negative sign indicates that the current flows in the opposite direction to the positive terminal of the voltage source.
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2) Suppose you wanted to use an electron microscope to see individual atoms that visible light can't see. Would you want fast moving electrons or slow moving electrons? Why?
Fast moving electrons would be better than slow moving electrons to see individual atoms that visible light can't see.
An electron microscope is a type of microscope that uses electrons instead of visible light to produce an image. The wavelength of electrons is much shorter than that of visible light, which allows electron microscopes to produce much higher-resolution images. The two types of electron microscopes are transmission electron microscopes (TEMs) and scanning electron microscopes (SEMs).
A TEM works by firing a beam of electrons through a thin specimen, allowing the electrons to pass through the specimen and create an image on a screen. SEMs, on the other hand, fire a beam of electrons at the surface of a specimen and use the reflected electrons to create an image.
While both types of electron microscopes use electrons to produce images, the speed of the electrons is an important factor in their ability to resolve individual atoms. In order to see individual atoms, the electrons need to have a very short wavelength, which requires them to be moving very quickly. Therefore, fast moving electrons would be better than slow moving electrons to see individual atoms that visible light can't see.
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Question 2 In the Davisson-Germer experiment using a Ni crystal, a second-order beam is observed at an angle of 55°. For what accelerating voltage does this occur?
The accelerating voltage for the Davisson-Germer experiment using a Ni crystal is 54.8 V. In the Davisson-Germer experiment, a beam of electrons is incident on a nickel crystal to study their diffraction behavior. This experiment gave a beautiful demonstration of wave-particle duality of electrons.
In the Davisson-Germer experiment, a beam of electrons is incident on a nickel crystal to study their diffraction behavior. This experiment gave a beautiful demonstration of wave-particle duality of electrons. The Ni crystal used in this experiment acts as a diffraction grating, scattering the electrons in various directions to form a diffraction pattern on the detector screen. A second-order beam is observed at an angle of 55°. This means that the electrons in the beam have undergone the second order of diffraction. Using Bragg's law we can relate the angle of diffraction and the interatomic spacing of the crystal.
From this, we can obtain the interatomic spacing of Ni (0.209 nm). Now we can calculate the wavelength of the electron beam by using the de-Broglie relation λ = h/p. where p is the momentum of the electrons and h is the Planck's constant. Using the relation, we get λ = 0.165 nm. Now we can use the relation for accelerating voltage V = h f/ q, where f is the frequency of the electron beam and q is the charge of the electron to obtain the voltage required. Here frequency is given as f = 1/λ. After substituting the values, we get V = 54.8 V. The voltage required to accelerate the electrons in the beam is 54.8 V. Therefore, the accelerating voltage for this experiment is 54.8 V.
Answer: The accelerating voltage for the Davisson-Germer experiment using a Ni crystal is 54.8 V.
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An electric water heater consumes 5 kW for 2 hours per day. What is the cost of running it for one month (30 days) if electricity costs 12 cents/kW.h? $36 $438 $18 $428
the cost of running the electric water heater for one month is $36.
To calculate the cost of running the electric water heater for one month, we need to determine the total energy consumption in kilowatt-hours (kWh) and then multiply it by the cost per kWh.
Given:
Power consumption = 5 kW
Duration of usage = 2 hours per day
Number of days = 30
Electricity cost = 12 cents/kWh
First, let's calculate the total energy consumption in kWh:
Energy consumption per day = Power × Time = 5 kW × 2 hours = 10 kWh
Total energy consumption for one month = Energy consumption per day × Number of days = 10 kWh/day × 30 days = 300 kWh
Now, let's calculate the cost:
Cost = Total energy consumption × Cost per kWh = 300 kWh × $0.12/kWh = $36
Therefore, the cost of running the electric water heater for one month is $36.
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7. Which of the following is NOT a point function? (A) Temperature (B) Pressure (C) Energy (D) Work transfer (E) None of these [1 point]
A point function is a property of a system that depends only on the current state of the system, such as temperature, pressure, energy, and entropy.
If the system undergoes a change in state, the value of the point function may change, but it is independent of the path by which the change occurred.
Only state functions are point functions, which means they depend only on the final and initial states of the system, regardless of how the process occurred.
As a result, work transfer is not a point function since its value is dependent on the path used to achieve the final state.
Thus, the correct answer is option (D) Work transfer.
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A point function is a thermodynamic variable that only depends on the present state of the system. These variables are independent of how the system reached its current state. A point function’s value only changes when the system’s state is modified.
Any thermodynamic system’s point function can be calculated using the system’s internal state variables.Let us consider option E, which states None of these. Every option A, B, C, and D, as per thermodynamics, are point functions. Thus, the answer to this question is option (E).Explanations:
Thermodynamics is the branch of physics that deals with heat, temperature, and their related phenomena. The concept of point functions is an important topic in thermodynamics.A point function is a thermodynamic variable whose value is only dependent on the present state of the system. They are also called state functions.
The point function is independent of the path taken by the system to reach its present state. As a result, any thermodynamic system’s point function can be calculated using the system’s internal state variables.
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a) A charged particle is accelerated from rest in a vacuum through a potential difference V. Show that the final speed v of the particle is given by the expression V = sqrt(2Vq/ m)
The final speed v of the particle is given by the expression V = √ (2qV/m)
To derive the expression of the final speed v of a charged particle accelerated from rest in a vacuum through a potential difference V, you will need to use the following formula:
KE (kinetic energy) = q (charge of the particle) V (potential difference)
Where q is the charge of the particle and V is the potential difference. As the charged particle is being accelerated from rest, we can assume that the initial kinetic energy KEi of the particle is zero. We can then equate the final kinetic energy KEf of the particle to the work done W by the electric field on the particle.
KEf = W
But W = qV, so
KEf = qV
Hence,v = √ (2KEf/m)
Initially, the kinetic energy of the particle is zero as it is at rest. When it is accelerated through the potential difference V, it gains kinetic energy equal to the work done on it by the electric field, which is given by
KEf = qV.
This final kinetic energy is then equated to the kinetic energy formula
KE = 1/2 mv²
Thus,
KEf = 1/2 mv²
Solving for v,
v = sqrt (2KEf/m)
Substituting KEf with qV,
v = sqrt (2qV/m)
which is the expression for the final speed of the particle when it is accelerated through a potential difference V in a vacuum.
Thus, the final speed v of the particle is given by the expression V = √ (2qV/m)
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L Moving to another question will save this response. uestion 1 "If a voltage across a resistor has increased by a factor of 50, the current will:" increase by a factor of 50 decrease by a factor of 50 O stay constant cannot be calculated Moving to another quoction will save this rocnonco Type here to search
If a voltage across a resistor has increased by a factor of 50, the current will decrease by a factor of 50.
When a voltage across a resistor is increased, the current through the resistor decreases. This is given by Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them.
Let us consider a simple example to understand this concept:
Suppose a resistor of resistance R ohms is connected to a voltage source of V volts.
According to Ohm's Law, the current through the resistor is given by I = V/R.
Suppose the voltage across the resistor is increased to 50V.
Then, the current through the resistor will be I = 50/R, which is 50 times less than the initial current.
Therefore, the current through the resistor decreases by a factor of 50 when the voltage across it is increased by a factor of 50.
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