Given: Manning's number = 0.02, Bed slope = 1:1200, Discharge per unit width = 1.5 m³/s/m
(i) Normal depth of flow: The normal depth of flow in an open channel is the depth of water flow that provides the
lowest
energy in the channel. The lowest energy in the channel indicates that the water flow has the least
velocity
, shear stress, and friction. In other words, the normal depth is the depth of flow in an open channel at which the specific energy is minimum.
The formula for calculating normal depth is as follows: $$y_n=\frac{Qn}{\sqrt{RS}}$$Where yn
= normal depth, Q
= Discharge per unit width, n
= Manning's number, R
= Hydraulic radius, S
= Bed slope
Here, R = (Depth of flow) / 2
So, Depth of flow = 2 y_n
Substituting the given values, we get:
$$y_n=\frac{1.5*0.02}{\sqrt{(2y_n/3)*(1/1200)}}$$$$y_n
=\frac{0.03}{\sqrt{y_n/1800}}$$$$y_n^3=0.03^2*1800$$$$y_n = 0.45 m$$Therefore, the normal depth of flow is 0.45 m.
(ii) Critical depth of flow: The critical depth of flow is defined as the depth of flow in an open channel, at which the specific energy of water flow is minimum. It is denoted by y_c.
The formula for critical depth is as follows: $$y_c = \frac{q^2}{gRS}$$ Where q =
discharge
per unit width
Substituting the given values, we get:
$$y_c = \frac{(1.5)^2}{9.81*(2*0.75)*(1/1200)}$$$$y_c = 1.04 m$$Therefore, the critical depth of flow is 1.04 m.
(iii) Channel slope: The channel
slope
is given by the formula: $$S = \frac{1}{n^2} \left(\frac{Q}{y^{2/3}}\right)^{2/3} R^{4/3}$$ Substituting the given values, we get:
Therefore, the channel slope is 0.00111.
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Bats are able to locate flying insects by emitting ultrasonic waves of frequency 82.52 kHz, which are then detected upon reflection (as echoes) from their prey.
Consider a bat flying with velocity =9m−1vbat=9ms−1 as it chases a moth that flies away from the bat with velocity moℎ=8m−1vmoth=8ms−1. The speed of sound in air is 340m−1340ms−1.
a) What is the frequency of the ultrasonic waves detected by the moth? (3 marks)
b) What frequency does the bat detect in the returning ultrasonic echo from the moth? (3 marks)
a) the frequency of the wave detected by the moth is = 80.62 kHz (approx)
b) The frequency detected by the bat in the returning ultrasonic echo from the moth is approximately 80.62 kHz.
a) Here, the frequency of the ultrasonic waves emitted by the bat is
f1 = 82.52 kHz.
The relative speed of the moth with respect to the bat is
v = v_bat - v_moth
= 9 - 8
= 1 m/s.
If the bat emits a wave of frequency f1, then the frequency of the wave detected by the moth is given by the Doppler's formula as follows:
f2 = (v_sound ± v)/(v_sound ± v_bat) f1
Here, v_sound = speed of sound in air
= 340 m/s
Substituting the values,
f2 = (340 ± 1)/(340 - 9) × 82.52 × 10^3
= 80.62 kHz (approx)
b) The moth is now at rest relative to the bat and hence, the Doppler effect due to relative motion will not be observed. Hence, the frequency detected by the bat in the returning ultrasonic echo from the moth is given by
f3 = f2 = 80.62 kHz (approx)
Therefore, the frequency of the ultrasonic waves detected by the moth is approximately 80.62 kHz.
The frequency detected by the bat in the returning ultrasonic echo from the moth is approximately 80.62 kHz.
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Find the value of the constant A that normalizes the wavefunction shown below in the first excited state. ¥(x, y, z, t) = A sin(kıx)sin (kqy)sin (k3z) e – iwt for 0 < x, y, z
The value of the constant A that normalizes the wavefunction shown below in the first excited state. ¥(x, y, z, t) = A sin(kıx)sin (kqy)sin (k3z) e – iwt for 0 < x, y, z is L^9 / 2^22.
For a wavefunction to be normalized, the integral of the square of the wavefunction should be equal to 1 over all space and time. That is
∫∫∫│¥(x, y, z, t)│^2 dxdydz = 1
Substituting the given wave function,
∫∫∫│A sin(kıx)sin (kqy)sin (k3z) e – iwt│^2 dxdydz = 1
∫∫∫ A^2 sin^2(kx)sin^2(ky)sin^2(kz) dx dy dz = 1
Since this is a normalized wave function we can say that the value of the above integral is equal to 1. Hence,
A^2 = 1/∫∫∫sin^2(kx)sin^2(ky)sin^2(kz) dx dy dz
We know that sin²x can be written as ½ - ½cos2x and applying that to sin²kx we get,
sin²(kx) = ½ - ½cos2(kx)
Therefore,
A^2 = 1/∫∫∫(½ - ½cos2(kx))(½ - ½cos2(ky))(½ - ½cos2(kz)) dx dy dz
A^2 = 1/8 * ∫∫∫(4 - 2(cos2(kx) + cos2(ky) + cos2(kz)) + cos2(kx)cos2(ky)cos2(kz)) dx dy dz
The limits of integration are not given in the question so we will assume them to be from 0 to L in all three directions.
A^2 = 1/8 * ∫∫∫(4 - 2(cos2(kx) + cos2(ky) + cos2(kz)) + cos2(kx)cos2(ky)cos2(kz)) dx dy dz
= 1/8 * ∫∫∫(4 - 2(cos²(kx) + cos²(ky) + cos²(kz)) + cos²(kx)cos²(ky)cos²(kz)) dx dy dz
= 1/8 * ∫∫∫(2 + cos²(kx)cos²(ky)cos²(kz)) dx dy dz
= 1/8 * ∫₀ˡ sin²(kx)dx * ∫₀ˡ sin²(ky)dy * ∫₀ˡ sin²(kz)dz
Since we are finding A^2 we can use this formula,
∫₀ˡ sin²(ax)dx = L/2
So,
A^2 = 1/8 * L³/8 * L³/8 * L³/8
A^2 = L^9 / 2^21
A = (L^9 / 2^21)^(1/2)
A = L^9 / 2^22
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17\%) Problem 6: As a segment of an exercise routine to build their pectoral muscles a person tretches a spring which has a spring constant k=740 N/m. Hints: deduction per hind. Hints remaining: − Feedback: dedaction per foodback. A 20\% Part (e) Calculate the work in joules required to streteh the springs from their relaxed state to the position x j =5/cm. a 20% Part (d) Write an equation for the work necessary to stretch the spring from the position x 1 to x 2. a 20% Part (e) Calculate the work in joules required to stretch the spring from x 1
=5/cm to x 2=8/cm.
In this problem, we are given a spring with a spring constant of 740 N/m. We need to calculate the work required to stretch the spring from its relaxed state to a specific position (x) and the work required to stretch it between two different positions (x1 and x2).
Part (d): The work required to stretch the spring from position x1 to x2 can be calculated using the equation: W = (1/2)k(x2^2 - x1^2), where k is the spring constant, x1 and x2 are the positions of the spring.
Part (e): To calculate the work required to stretch the spring from its relaxed state (x=0) to position x=5 cm, we use the same equation as in part (d) with x1 = 0 and x2 = 5 cm. Substitute these values into the equation and calculate the work in joules.
To calculate the work required to stretch the spring from x1 = 5 cm to x2 = 8 cm, again use the equation from part (d) with x1 = 5 cm and x2 = 8 cm. Plug in the values and calculate the work in joules.
By solving these equations, you can determine the work required to stretch the spring to a specific position or between two different positions, as requested in the problem.
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the new pressure (in atm) of the gas A rigid tank contains an amount of carbon dioxide at a pressure of 12.2 atm and a temperature of 29.0°C. Two-thirds of the gas is withdrawn from the tank, while the temperature of the remainder is raised to 49.3°C. What remaining in the tank? atm Need Help? Read
the new pressure of the gas in the tank is 4.71 atm (rounded off to two decimal places).
the remaining amount of carbon dioxide in the tank is (1 - 2/3) = 1/3.
Hence, the number of moles of carbon dioxide (n2) in the tank after the withdrawal is given as follows:n2 = (1/3) n1n2 = (1/3) (0.469 V)
n2 = 0.156 V
Finally, the temperature of the remaining gas is raised to 49.3°C.
Therefore, the pressure of the gas at this temperature (P2) can be calculated using the ideal gas law as follows:
P2V = n2RT2
Solving for P2, we get:P2 = (n2 / V) RT2 / PV2 = (0.156 V / V) (0.0821 L atm K-1 mol-1) (322.45 K) / (1 atm)P2 = 4.71 atm
Therefore, the new pressure of the gas in the tank is 4.71 atm (rounded off to two decimal places).
Hence, the answer is 4.71.
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i
need the solution of the HW
below are the examples that are mentioned in the HW
i need the solution with clear handwriting please
in 45 min
H.W.: Repeat examples (3) \& (4) \& (5) if the faults occur through impedance of \( 0.02 \) p.u.
Esample (3): Calculate the sukeransient Gull current in cackly phase for a dead shoet carcuit on one p
The question is asking for the solution of an electrical engineering homework problem which involves calculating the transient fault current in an electrical circuit. The problem involves repeating three examples with a fault impedance of 0.02 p.u. in 45 minutes.
The following is a detailed solution to the problem.The transient fault current in a power system is the current that flows through the system when a fault occurs. A fault is a short circuit that occurs in an electrical system. To calculate the transient fault current in a system, we need to know the fault impedance,
the fault type, and the system parameters.Example (3): Calculate the transient fault current in each phase for a dead short circuit on one phase. The impedance of the fault is 0.02 p.u. The system parameters are as follows:Line voltage = 11 kVLine impedance = 0.8 p.u.Line inductance = 1.5 mHLine capacitance = 0.05 μFLoad impedance = 10 ΩAssuming a dead short circuit on phase A,
the following steps can be followed to calculate the transient fault current:1. Convert the fault impedance to ohms, using the formula Zf = V/fault current. 2. Calculate the fault current by dividing the line voltage by the total impedance of the system. 3. Calculate the equivalent impedance of the line and the load. 4. Calculate the total impedance of the system. 5. Calculate the equivalent impedance of the faulted phase. 6. Calculate the total fault current. 7. Calculate the transient fault current in each phase. The calculation can be repeated for phase B and C.
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what four factors affect the magnitude of the induced emf in a coil of wire?
There are four factors that affect the magnitude of the induced emf in a coil of wire.
1. Magnetic Field Strength: The magnitude of the induced emf in a coil of wire is directly proportional to the magnetic field strength. So, if the magnetic field strength increases, the induced emf also increases.
2. Number of Turns in the Coil: The magnitude of the induced emf in a coil of wire is directly proportional to the number of turns in the coil. So, if the number of turns increases, the induced emf also increases.
3. Area of the Coil: The magnitude of the induced emf in a coil of wire is directly proportional to the area of the coil. So, if the area of the coil increases, the induced emf also increases.
4. Rate of Change of Magnetic Field: The magnitude of the induced emf in a coil of wire is directly proportional to the rate of change of the magnetic field. So, if the rate of change of the magnetic field increases, the induced emf also increases.
The magnitude of the induced emf in a coil of wire can be calculated using the formula:
E = -N(dΦ/dt)
where E is the induced emf, N is the number of turns in the coil, Φ is the magnetic flux through the coil, and t is the time.
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The Ecliptic crosses the Celestial Equator at two points, these are called the None of the above Nodes Equinoxes Solstices
According to the problem The Ecliptic crosses the Celestial Equator at two points, these are called the Equinoxes.
The Equinoxes occur twice a year, typically around March 20th and September 22nd, when the Earth's axis is neither tilted towards nor away from the Sun. During these times, the Ecliptic (the apparent path of the Sun as seen from Earth) intersects with the Celestial Equator (the projection of Earth's equator onto the celestial sphere). These points of intersection are known as the Equinoxes, specifically the Vernal Equinox (around March 20th) and the Autumnal Equinox (around September 22nd). At the Equinoxes, day and night are of approximately equal length all over the world.
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Score E. (Each question Score 9 points, Total Score 9 points) It is known that the amplitude of a single frequency modulation wave is 10 V, and the instantaneous frequency is f(t)=10° +10° cos2x10³t (Hz), try to find: (1) Is the linear modulation or nonlinear modulation? Why? (2) Write down the expression of this frequency modulation wave; (3) The maximum frequency offset, frequency modulation index and bandwidth of the frequency modulation wave; (4) If the frequency of the modulation signal is increased to 2x10³Hz, how does the frequency offset, frequency modulation index and bandwidth of the frequency modulation wave change?
The given frequency modulation wave is nonlinear. The expression of the wave is f(t) = 10° +10° cos2x10³t. The maximum frequency offset, modulation index, and bandwidth are 62.8 Hz, 0.00628, and 145.6Hz, respectively.
(1) It is nonlinear modulation because the frequency modulation index of this wave is changing with time.
(2) The expression of this frequency modulation wave is given by:
f(t) = fc + kFmcos(2πfmt)
f(t) = 10° +10° cos2x10³t (Hz) is the expression of the frequency modulation wave.
(3) The maximum frequency offset can be found by taking the derivative of the frequency modulation with respect to time:
df/dt = 2πkFm.
From this, we can see that the maximum frequency offset is 2πkFm = 2π x 10° = 62.8 Hz.
The frequency modulation index k is equal to the maximum frequency deviation divided by the modulating frequency. In this case, k = 62.8/10,000 = 0.00628.
The bandwidth of the frequency modulation wave is given by:
B = 2(Δf + fm) = 2(kFm + fm), where Δf is the maximum frequency deviation and fm is the modulating frequency.
In this case, the bandwidth is 2(62.8 + 10) = 145.6 Hz.
(4) If the frequency of the modulation signal is increased to 2x10³Hz, the frequency modulation index will decrease because it is proportional to the modulating frequency. Therefore, k = 62.8/20,000 = 0.00314.
The maximum frequency offset will remain the same at 62.8 Hz, but the bandwidth will increase to 2(62.8 + 20) = 165.6 Hz.
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The q- v relation of a linear time-varying capacitor is C (t) = t + 2 cos t Determine whether this capacitor is passive or active.
A capacitor is an electronic device that stores electric charge in an electric field. The capacitor consists of two metallic plates separated by a non-conducting material called a dielectric.
There are two types of capacitors: active capacitors and passive capacitors. The passive components cannot amplify, rectify, or generate power and must be powered by an external source. The active components can do this and can generate power.A capacitor is a passive component that is used to store electric charge in an electric field.
The q-v relationship of a linear time-varying capacitor is given by C(t) = t + 2cos(t).To determine whether the capacitor is passive or active, we need to know if it is possible to extract power from it. If a capacitor is passive, then it cannot generate power, but an active capacitor can extract or generate power.As the given capacitor is time-varying and the relation between q and v is linear, it is a passive capacitor. Therefore, the given capacitor is passive.
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A 62 kg canoeist stands in the middle of her canoe. The canoe is 2.9 m long, and the end that is closest to land is 2.6 m from the shore. The canoeist now walks toward the shore until she comes to the end of the canoe. Suppose the canoeist is 3.4 m from shore when she reaches the end of her canoe. What is the canoe's mass? Express your answer using two significant figures.
The center of mass(CM) does not move, the following equation can be written after the canoeist walks towards the shore: (m)(0.8) = (M)(1.45), where 1.45 m is the initial location of the center of mass. Solving for M yields: M = 0.8m / 1.45Substituting m = 62 kg yields: M = 0.8 x 62 / 1.45 = 34 kg (approx). Hence, the canoe's mass is 34 kg (approx).
As per the question, the canoeist stands in the middle of her canoe which is 2.9 m long, and the end that is closest to the land is 2.6 m from the shore. The canoeist walks towards the shore until she comes to the end of the canoe. Suppose the canoeist is 3.4 m from shore when she reaches the end of her canoe. Therefore, the distance between the canoe and the shore (d) after the canoeist walks is 3.4 - 2.6 = 0.8 m. Since the canoe and the canoeist are initially at rest, the momentum(p) before and after the canoeist walks towards the shore will be conserved. Therefore, the initial momentum(Pi) is equal to the final momentum (Pf) . Pi = Pf 0 = mv + M(V1)where m is the mass of the canoeist, M is the mass of the canoe, V1 is the velocity of the canoe, and v is the velocity of the canoeist.
Since the canoeist and the canoe are initially at rest, v and V1 are equal to zero, which implies that 0 = mv + 0. Now, when the canoeist walks to the end of the canoe, the center of mass of the canoeist and canoe moves towards the end of the canoe. The location of the CM after the canoeist walks can be calculated as follows: 2.9 - (2.9 - 0.8) x (m / (m + M)), which simplifies to 0.8(m / (m + M).
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Calculate the radius of an a particle (in femtometers or 10-15 m).
The radius of an alpha particle is approximately 1.68 femtometers (or 1.68 x 10^-15 meters).
The radius of an alpha particle (in femtometers) can be calculated using the formula:
r = r0A^1/3,
where r0 is a constant and A is the mass number of the alpha particle.
The mass number of an alpha particle is 4, so:
A = 4r0 is another constant. Its value is 1.25 femtometers, so:
r0 = 1.25 femtometers
r = r0A^1/3= 1.25 x 4^(1/3) femtometers≈ 1.68 femtometers
Hence, the radius is approximately 1.68 femtometers (or 1.68 x 10^-15 meters).
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Draw an Alternate / Simplified version of this logisim circuit
with thesame resulting truth table.
This circuit can be simplified, by just connecting A and B to a NOR logic gate.
To answer this question, we use all the principles of logic gates and their truth tables.
In the original circuit (labeled 1), we have two gates, AND and XOR.=, through which the same outputs are passed, A and B. The outputs of these gates are passed through the NOR gate, which gives us the final result.
AND Gate can be defined as A.B
EXOR Gate is defined as either, but not both inputs should be true.
NOR is the opposite of OR, (A+B)'
The truth table for the whole process is given in Image 2.
As we can clearly see, the truth values for C NOR D are the same as A NOR B. Thus, we can simply write the circuit as follows (Image 3).
The whole circuit is modified by just putting a NOR gate, but retaining the same outputs, as seen in the truth table.
Question Image: Image 4
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Mr. Krishnam, an adventurous archaeologist crosses between two rock cliffs by slowly going hand over hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope. The rope will break if the tension in it exceeds 2.50 x 10¹N, and Krishnam's mass is 90kg. (a) if the angle 0 is 10.0⁰, find the tension in the rope. (b) what is the smallest value of the angle 0 can have if the rope is not to break?
(a) The force tension in the rope The formula for force is:F = ma
Where,F = Force (in N)
= Tension in the rope. (i.e., what we need to calculate)
m = Mass of the object (in kg)
= 90 kg
a = acceleration (in m/s²)
= g
= 9.8 m/s²
The total force acting on Krishnam is the resultant of weight and tension. The weight force acting on him is given by:
Weight, W = m *
g = 90 kg * 9.8 m/s²
= 882 N
The forces acting on Krishnam are shown below:From the figure, the angle between the vertical and the rope is 10⁰. We can calculate the angle between the rope and the horizontal as follows: tan(θ) = perpendicular/baseWhere, θ is the angle between the rope and the horizontal.perpendicular
= Length of the rope above Krishnam
= Length of the rope below Krishnam
= L/2 (Since Krishnam is at the mid-point)base
= The horizontal distance between the two cliffs
= Lcos(θ)
= (L/2) / base
Therefore, cos(θ) = base / (L/2)
Base, b = (L/2) cos(θ)
Therefore, Tension in the rope, T = FnetFnet
= Resultant force
= T - WComponent of the tension along the horizontal, Tcos(θ) = Fhoriz
= T - W sin(θ)
= Fvert
= 0
Therefore,Fhoriz = Fvert tan(θ)
= (Fhoriz) / (T)T
= Fhoriz / tan(θ)
= (T - W) / tan(θ)T * tan(θ) - W
= FhorizT * tan(10⁰) - 882 N
= 0T
= 882 N / tan(10⁰)
= 5,122 N
Therefore, the tension in the rope is 5,122 N.(b) The smallest angle between the rope and the horizontal that ensures the rope does not break can be calculated as follows:We know that the tension in the rope should not exceed 2.50 x 10¹N. Therefore,T ≤ 2.50 x 10¹NThe tension in the rope can be calculated as follows:
T = Fhoriz / tan(θ)T * tan(θ)
= FhorizFhoriz
= T * tan(θ)
Therefore, the weight acting on Krishnam is given by:W = m * g
= 90 kg * 9.8 m/s²
= 882 N
When the rope is about to break, the tension in the rope equals the maximum tension that can be withstood. Therefore, T = 2.50 x 10¹N.
Tan(θ) = Fhoriz / TTan(θ)
= 5,122 N / (2.50 x 10¹N)θ
= 11.1⁰
Therefore, the smallest value of the angle θ is 11.1⁰ when the rope is not to break.
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why important to remove any excess water from the metal specimen before transferring to the calorimeter?
It is important to remove any excess water from the metal specimen before transferring to the calorimeter because the presence of excess water affects the accuracy of the results obtained from the calorimetry experiment.
What is calorimetry?Calorimetry is the measurement of heat transfer, typically related to chemical reactions or physical changes. The calorimeter is used to measure the amount of heat released or absorbed during a chemical reaction or phase transition. A calorimeter is a device that is used to measure the heat released or absorbed by a chemical reaction.The calorimeter is commonly used in various applications such as:To determine the heat of fusion of ice.To determine the heat of vaporization of water.
To determine the heat of combustion of a substance.To determine the heat capacity of a substance.How does the presence of excess water affect the accuracy of the results obtained from the calorimetry experiment?During the calorimetry experiment, the excess water in the metal specimen will increase the amount of heat required to heat the metal to a specific temperature. This additional heat energy absorbed by the water will affect the accuracy of the results obtained from the calorimetry experiment. The presence of excess water in the metal specimen would make it difficult to calculate the heat capacity of the metal accurately, leading to inaccurate results. Hence, it is important to remove any excess water from the metal specimen before transferring it to the calorimeter.
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ELECTRONICS (DC BIASING BJTs)
what is the bias (forward or reverse) of the emitter and collector
junctions when the transistor is in cutoff, active and saturation
regions. make a table please.
When a bipolar junction transistor (BJT) is operating in different regions, the bias (forward or reverse) of the emitter and collector junctions can vary.
Here is a table explaining the bias conditions for the emitter and collector junctions in the cutoff, active, and saturation regions:
| Region | Emitter Junction Bias | Collector Junction Bias |
|--------------|----------------------|-------------------------|
| Cutoff | Reverse | Reverse |
| Active | Forward | Reverse |
| Saturation | Forward | Forward |
1. Cutoff Region:
Emitter Junction Bias: Reverse Bias
In the cutoff region, the emitter junction is reverse-biased. This means that the voltage applied to the emitter terminal is higher than the voltage applied to the base terminal.
Collector Junction Bias: Reverse Bias
Similarly, the collector junction is also reverse-biased in the cutoff region. The voltage applied to the collector terminal is higher than the voltage applied to the base terminal.
2. Active Region:
- Emitter Junction Bias: Forward Bias
In the active region, the emitter junction is forward-biased. This means that the voltage applied to the emitter terminal is lower than the voltage applied to the base terminal.
- Collector Junction Bias: Reverse Bias
The collector junction remains reverse-biased in the active region. The voltage applied to the collector terminal is higher than the voltage applied to the base terminal.
3. Saturation Region:
Emitter Junction Bias: Forward Bias
In the saturation region, the emitter junction is still forward-biased. The voltage applied to the emitter terminal is lower than the voltage applied to the base terminal.
Collector Junction Bias: Forward Bias
Unlike the previous regions, the collector junction is now forward-biased in the saturation region. The voltage applied to the collector terminal is lower than the voltage applied to the base terminal.
These bias conditions determine the operation of the BJT in different regions and play a crucial role in controlling its behavior as an amplifier or switch.
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The height of a helicopter above the ground is given by h = 2.55e, where his in meters and is in seconds. At t = 2.35 5, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground? Need Help? Read it
The mailbag reaches the ground about 2.355 seconds after it is released.
The height of the helicopter above the ground is given by h = 2.55t², where h is in meters and t is in seconds. The height of the helicopter at t = 2.355 is h = 2.55(2.355)² ≈ 14.5 meters.
When the mailbag is dropped, it falls freely under gravity. Its height h is given by h = -4.9t², where h is in meters and t is in seconds. We want to find how long it takes for the mailbag to hit the ground, which is when its height h = 0. So we set -4.9t² = 0 and solve for t: -4.9t² = 0 t² = 0 t = 0So the mailbag hits the ground when t = 0. Since
the mailbag is dropped at t = 2.355, the time it takes for the mailbag to reach the ground after it is released is time = 0 - 2.355 ≈ -2.355 seconds (since it takes 2.355 seconds for the mailbag to reach the ground after it is released).
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This is a
fluid mechanics. I need to solve this question as soon as possible.
Thank you
Q1: In the following manometer, calculate the specific gravity of the oil if the reading of pressure gauge is \( 0.25 \) bar (Answer \( S G_{o i l}=0.093 \) )
The specific gravity of the oil can be calculated using the following steps:
Step 1: Find the pressure difference between the two arms of the manometer using the reading of the pressure gauge. Here, the reading of the pressure gauge is given as 0.25 bar.
Therefore, the pressure difference can be calculated as:
Pressure difference = Reading of the pressure gauge × Density of the manometer fluid= 0.25 × 800 = 200 N/m²
Step 2: Find the vertical distance between the two arms of the manometer, which is h = 60 mm.Step 3: The specific gravity of the oil can be calculated using the following formula:
SG = h/ρgP
where, SG is the specific gravity of the oil,h is the vertical distance between the two arms of the manometer,ρ is the density of the manometer fluid, g is the acceleration due to gravity, and
P is the pressure difference between the two arms of the manometer.
Substituting the values, SG = h/ρgP = h/γPwhere,γ = ρg is the specific weight of the manometer fluid.
Substituting the values, SG = h/γP = 60/(800 × 9.81 × 200) = 0.093
Therefore, the specific gravity of the oil is 0.093.
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Which of the following polar coordinates gives the same point as the cartesian coordinates point (x,y) = (-3,3,3) (5,0) = (677) ( 7,0) = (6, 1) 117 77 -6,
The polar coordinates(PC) are (r,θ) = (sqrt(18), -45°). Hence, option (77) is the correct choice.
We are given Cartesian coordinates(CC) of the point which are (-3, 3). We are asked to find the equivalent polar coordinates(EPC). We can obtain these polar coordinates by using the following formulas : r = sqrt(x^2 + y^2) and θ = tan^-1(y/x)Substituting the given values in the above formulas, we get: r = sqrt((-3)^2 + 3^2) = sqrt(18)θ = tan^-1(3/-3) = tan^-1(-1)We can simplify the second equation further as follows:θ = tan^-1(-1) = -45°.
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8. Which way does the electric field point at location X?
X 9μC
A.) ←
B.) ↑
C.) →
D.) ↓
What is the electric field at point A due to charges 1 and 2?
A← 0.4 m→ 1
↑
0.2 m
↓
2
Q1 = + 5 μC Q2 = +5μC
The electric field point at location X which has a charge of 9μC is shown in the figure below.
[tex]\overrightarrow{E}[/tex]] is the direction of electric field. At point A due to charges 1 and 2, the direction of electric field will be to the right because of the repulsion forces of like charges.
The value of electric field will be calculated by Coulomb's law as given below.
Electric field at point A due to charges 1 and 2 is given by
[tex]E=\frac{kQ}{r^2}[/tex]Where [tex]k=9 \times 10^9 \text{ N}\cdot\text{m}^2/\text{C}^2[/tex]
is the Coulomb's constant, [tex]Q=5 \text{ } \mu C[/tex] is the charge, [tex]r=\sqrt{(1.4)^2+(0.2)^2}=1.405[/tex] is the distance between the two charges.Now putting the values of k, Q and r, we get
Electric field [tex]E=\frac{9 \times 10^9 \times 5 \times 10^{-6}}{(1.405)^2}=18.7 \text{ }N/C[/tex]
So, the electric field at point A due to charges 1 and 2 is 18.7 N/C.
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A dimensionally homogenous equation for the pressure difference in a blocked artery is based on the pressure drop Ap (ML-¹T-2), density p (ML-³), and velocity V. Determine the dimensions for the constant K: Др = KV + pV² (a) L-¹T (b) MOLOTO (c) ML-²T-1 (d) M²L²T-2 (e) ML-²T-3
The dimensional homogenous equation for the pressure difference in a blocked artery is given by the equation:Др = KV + pV²Where, Др = pressure differenceAp = pressure drop (ML-¹T-2)p = density (ML-³)V = velocityK = constantWe are to determine the dimensions for the constant K.Therefore, the correct option is (e) ML⁻²T⁻³.
Let's determine the dimensions of the left-hand side (LHS) of the equation:Др = KV + pV²Др = pressure difference = Ap (ML-¹T-2)V = velocity = L/TSo,Др = ApV + pV² = M L⁻¹ T⁻² L T⁻¹ + M L⁻³ (L T⁻¹)²= M L⁻¹ T⁻² L T⁻¹ + M L⁻³ L² T⁻²= M L⁻¹ T⁻¹ (L + L) + M L⁻³ L² T⁻²= M L⁻¹ T⁻¹ L + M L⁻¹ T⁻¹ L + M L⁻³ L² T⁻²
Hence, the dimensions of the left-hand side of the equation are M L⁻¹ T⁻¹ L + M L⁻¹ T⁻¹ L + M L⁻³ L² T⁻² = M L⁻¹ T⁻¹ L (1 + 1) + M L⁻³ L² T⁻² = M L⁻¹ T⁻¹ L² + M L⁻³ L² T⁻²Now, let's determine the dimensions of the right-hand side (RHS) of the equation:K = Др/V + pV= M L⁻¹ T⁻¹ L²/L T⁻¹ + M L⁻³ (L T⁻¹)= M L⁻² T⁻² + M L⁻² T⁻²= M L⁻² T⁻²Hence, the dimensions of the constant K are ML⁻²T⁻².
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2.0-cm-diameter copper ring has 8.0×10 9
excess Part A electrons. A proton is released from rest on the axis of the ring, 5.0 cm from its center. What is the proton's speed as it passes through the center of the ring? Express your answer with the appropriate units.
The speed of the proton as it passes through the center of the ring is approximately 7.69 × 10⁶ m/s.
To solve this problem, we can use the principle of conservation of mechanical energy.
The electric potential energy of the system is converted into the kinetic energy of the proton as it passes through the center of the ring. We can equate the electric potential energy to the kinetic energy to find the speed of the proton.
The electric potential energy between the proton and the ring can be calculated using the formula:
U = (k * Q₁ * Q₂) / r
Where U is the electric potential energy, k is the Coulomb constant (approximately 8.99 × 10⁹ Nm²/C²), Q₁ is the charge of the proton (1.6 × 10⁻¹⁹ C), Q₂ is the charge of the excess electrons in the ring (8.0 × 10⁹ electrons), and r is the distance between the proton and the center of the ring (5.0 cm = 0.05 m).
Substituting the given values into the formula, we get:
U = (8.99 × 10⁹ Nm²/C²) * (1.6 × 10⁻¹⁹ C) * (8.0 × 10⁹) / 0.05 m
Simplifying the expression, we find:
U ≈ 2.87 J
Since the electric potential energy is converted into kinetic energy, we can write:
U = (1/2) * m * v²
Where m is the mass of the proton (approximately 1.67 × 10⁻²⁷ kg) and v is the speed of the proton.
Rearranging the equation to solve for v, we get:
v = √(2 * U / m)
Substituting the known values, we have:
v = √(2 * 2.87 J / 1.67 × 10⁻²⁷ kg)
Calculating this, we find:
v ≈ 7.69 × 10⁶ m/s
Therefore, the speed of the proton as it passes through the center of the ring is approximately 7.69 × 10⁶ meters per second.
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5. Choose the correct answer: a) The reason of high input resistance of the MOSFET is: 1. The insulator layer. 2. The reverse biasing. 3. The forward biasing. b) Which transistor has no Ipss parameter?. 1. JFET. 2. E-MOSFET. 3. D-MOSFET. c) For an n-channel D-MOSFET transistor, at what condition can gm be greater than gmo?. 1. VGs is positive. 2. VGs is negative. 3. VGS=0. d) A certain amplifier has an Rp-1KQ. When a load resistance of 1KQ is capacitively coupled to the drain, the gain will reduce to the: 1. Half. 2. Quarter. 3. Not change.
a) The reason for the high input resistance of a MOSFET is the insulator layer, b) The transistor without an Ipss parameter is the JFET , c) gm can be greater than gmo for an n-channel D-MOSFET when VGs is negative , d) When a load resistance of 1KQ is capacitively coupled to the drain, the gain of the amplifier will not change.
a) The reason for the high input resistance of a MOSFET is primarily due to the insulator layer. In a MOSFET, the gate terminal is separated from the channel by a thin layer of insulating material, typically silicon dioxide (SiO2). This insulator layer acts as a barrier and prevents the flow of direct current between the gate and the channel. As a result, the input resistance of the MOSFET becomes very high, often in the order of megaohms.
b) The transistor that does not have an Ipss parameter is the JFET (Junction Field-Effect Transistor). Ipss, also known as IDSS (Drain Current at Zero Gate Voltage), is a parameter associated with MOSFETs and refers to the drain current when the gate-to-source voltage (VGS) is zero. JFETs, on the other hand, do not have a similar parameter because their operation is based on the control of current flow through a conducting channel, rather than the formation of a depletion region like in MOSFETs.
c) For an n-channel D-MOSFET transistor, the condition where gm (transconductance) can be greater than gmo (transconductance with VGS = 0) is when VGs (gate-to-source voltage) is negative. In a D-MOSFET, the transconductance gm represents the relationship between the change in drain current and the change in gate-to-source voltage. It is typically greater than gmo (which is the transconductance at VGS = 0) when the gate voltage is negative, indicating that the transistor is in the saturation region of operation.
d) When a load resistance of 1KQ (1 kilohm) is capacitively coupled to the drain of an amplifier with an Rp (plate resistance) of 1KQ, the gain of the amplifier will not change. The coupling capacitor allows the AC component of the signal to pass through while blocking the DC component. Since the coupling capacitor blocks the DC bias from the load resistor, it does not affect the operating point of the amplifier. Therefore, the gain of the amplifier remains unaffected by the addition of the capacitively coupled load resistor.
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True or False
The arm of a space shuttle, which carries its payload, suddenly malfunctions and releases the payload. It is expected that the payload will drift into deep space and became a space junk.
_________
lo, one of Jupiter's moons, does not crash into the surface of Jupiter because it is beyond the main pull of Jupiter's gravity.
_________
Eddie accidentally throws his aspirator straight up after seeing the leper down Neibolt Street. Neglecting air resistance, the potential energy of the aspirator decreases while it is going up.
_________
The arm of a space shuttle, which carries its payload, suddenly malfunctions and releases the payload. It is expected that the payload will drift into deep space and become a space junk. This statement is true.
If the arm of a space shuttle, which carries its payload, suddenly malfunctions and releases the payload, it is expected that the payload will drift into deep space and become space junk.
2. Io, one of Jupiter's moons, does not crash into the surface of Jupiter because it is beyond the main pull of Jupiter's gravity. This statement is false. Io, one of Jupiter's moons, does not crash into the surface of Jupiter not because it is beyond the main pull of Jupiter's gravity, but because it is within the gravitational field of Jupiter, which provides a centripetal force on Io. This force is responsible for holding Io in its orbit around Jupiter.
3. Eddie accidentally throws his aspirator straight up after seeing the leper down Neibolt Street. Neglecting air resistance, the potential energy of the aspirator decreases while it is going up. This statement is false. Neglecting air resistance, the potential energy of the aspirator increases while it is going up. Potential energy is defined as the energy stored in an object due to its position. When the aspirator is thrown straight up, it gains potential energy as it moves higher into the air.
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A light ray is directed toward the surface of a block of crown glass at an angle of 37.0 with respect to the normal (a line perpendicular to the surface at the spot where the ray hits the block) Some of the light is reflected and the rest refracted. What is the angle (in degrees) between the reflected and refracted rays? 102.3 x What angle ties between the surface and the reflected ray? What angie lies between the surface and the refracted ray? Be sure to use the correct index of refrection for the substance making up the block. Make sure that your calculator is in degree mode
The angle between the reflected and refracted rays in crown glass is 64.5°. the angle between the reflected and refracted rays is 102.3°. The angle between the surface and the reflected ray is 37.0° and the angle between the surface and the refracted ray is 25.5°.
The angle between the surface and the reflected ray is 37.0°. The angle between the surface and the refracted ray is 25.5°.Explanation:Given,The angle of incidence is θ1 = 37.0°,The angle of refraction is θ2.The refractive index of crown glass is n = 1.52.Using Snell's law,[tex]n1sinθ1 = n2sinθ2[/tex] The refractive index of air is 1.0003 and the refractive index of crown glass is 1.52. The angle of incidence is 37°.
Therefore, we can calculate the angle of refraction using Snell's law:[tex]1.0003 sin(37) = 1.52 sin(θ2)θ2 = 25.5°[/tex] (angle between the surface and the refracted ray)The angle of incidence is 37.0° and the angle of refraction is 25.5°. Hence, the angle of reflection can be calculated as follows:[tex]Θr = ΘiΘr = 37.0°[/tex](angle between the surface and the reflected ray)The angle between the reflected and refracted rays can be calculated as follows:[tex]Θ = 180 - (Θi + Θr)Θ = 180 - (37.0 + 25.5)Θ = 117.5°Θ ≈ 102.3°[/tex]
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(a) What is "crossover distortion", and why does this circuit have it when R = 1kn (b) What value of R will eliminate the distortion assuming the transistors are perfectly matched and have base-emitter junction voltages of 0.7V?
Crossover distortion is a type of distortion that occurs when an audio amplifier is not properly biased. When a transistor amplifier is biased into its active mode, the output signal is relatively linear.
As the signal crosses zero, the amplifier transitions from one transistor conducting to the other. During this time, the amplification temporarily stops, resulting in what is known as "crossover distortion."(a) Crossover distortion occurs when a transistor amplifier is not properly biased, resulting in the amplification temporarily stopping as the signal crosses zero. When R = 1kΩ, this circuit has crossover distortion because the 1kΩ resistor causes too much voltage to be dropped across the transistors' base-emitter junctions.
This prevents the amplifiers from properly switching and can lead to the presence of crossover distortion.(b) The value of R that will eliminate crossover distortion assuming the transistors are perfectly matched and have base-emitter junction voltages of 0.7V is 3.9kΩ. This can be achieved by adding a resistor in series with the two base resistors, as shown in the figure below.
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The equation for calculating how much energy (E in units of Joules or "J") is required to heat an object is E=CmΔT. If we are heating water, the value for C (the specific heat content) is 4100 Joules per kg per Kelvin (or "J/kg/K"). If you multiply C by ΔT, what units will be leftover?
• kg/J/K
• J/kg/K/kg/
• J
• J/kg
After multiplying C by ΔT, the units that are left over are Joules (J), which is the standard unit of energy. This indicates the amount of energy required to heat the object by the specified temperature change.
When calculating the energy required to heat an object using the equation E = CmΔT, where E represents energy, C is the specific heat content, m is the mass of the object, and ΔT is the temperature change, the units that will be leftover after multiplying C by ΔT are Joules (J).
The specific heat content (C) is measured in J/kg/K, indicating the amount of energy required to raise the temperature of one kilogram of the substance by one Kelvin. The temperature change (ΔT) is measured in Kelvin as well.
When these two quantities are multiplied together, the units cancel out as follows:
C (J/kg/K) * ΔT (K) = J/kg * K * K = J.
The kilogram (kg) unit from the specific heat content (C) and the Kelvin (K) unit from the temperature change (ΔT) both appear in the multiplication, resulting in the kilogram and Kelvin units being divided out. The remaining unit is Joules (J), which represents the amount of energy required to heat the object.
Therefore, after multiplying C by ΔT, the units that are left over are Joules (J), which is the standard unit of energy. This indicates the amount of energy required to heat the object by the specified temperature change.
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Question 1
An object's position as a function of time in one dimension is given by the expression; 3.74t2+2.89t+7.24 where are constants have proper SI Units. What is the object's position at t=2.44?
_______
Question 2
An object's position as a function of time in one dimension is given by the expression; 3.26t2+2.44t+5.43 where are constants have proper SI Units. What is the object's average velocity between the times t=3.23 s and t=6.27 s?
_________
The object's position at t=2.44 is [tex]\boxed{37.896\ m}[/tex] (approx).
1) The object's position as a function of time in one dimension is given by the expression; 3.74t² + 2.89t + 7.24. We need to find the position of the object at t=2.44.
Position of object at t = 2.44 will be;[tex]3.74t^{2}+2.89t+7.24[/tex][tex]3.74\times (2.44)^{2}+2.89\times (2.44)+7.24[/tex][tex]3.74\times 5.9536+2.89\times 2.44+7.24[/tex][tex]22.2864+8.3696+7.24[/tex]
Hence, the object's position at t=2.44 is [tex]\boxed{37.896\ m}[/tex] (approx).
2) An object's position as a function of time in one dimension is given by the expression; 3.26t² + 2.44t + 5.43.
We need to find the object's average velocity between the times t=3.23 s and t=6.27 s.
The object's average velocity can be calculated as follows;[tex]v_{ave}=\frac{Displacement}{time\ taken}[/tex]
In this case, the time taken is the difference between the final time and the initial time.
That is, [tex]t_{f}-t_{i}[/tex].
Therefore, the object's average velocity between t=3.23 s and t=6.27 s is given as;[tex]v_{ave}=\frac{Displacement}{time\ taken}=\frac{d_{f}-d_{i}}{t_{f}-t_{i}}[/tex][tex]v_{ave}=\frac{(3.26\times 6.27^{2}+2.44\times 6.27+5.43)-(3.26\times 3.23^{2}+2.44\times 3.23+5.43)}{6.27-3.23}[/tex][tex]v_{ave}=\frac{[3.26\times (6.27)^{2}-3.26\times (3.23)^{2}]+[2.44\times (6.27-3.23)]}{6.27-3.23}[/tex][tex]v_{ave}=\frac{[3.26\times (39.4569-10.4329)]+2.44\times (2.04)}{3.04}[/tex][tex]v_{ave}=\frac{(3.26\times 29.024)+4.976}{3.04}[/tex][tex]v_{ave}=\frac{94.409+4.976}{3.04}[/tex][tex]v_{ave}=\frac{99.385}{3.04}[/tex]
Hence, the object's average velocity between the times t=3.23 s and t=6.27 s is [tex]\boxed{32.67\ m/s}[/tex] (approx).
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Develop the general solution of the series RLC circuit with power
source.
AC voltage (state variables Vc , iL ), assign values to the
components and plot waveforms
An RLC circuit refers to a resistor, an inductor, and a capacitor linked together in series with an alternating current source. This circuit serves as a low-pass filter for the AC signals. A voltage applied to an RLC circuit leads to the creation of current, leading to a phase shift among the voltage and current.
The general solution of the series RLC circuit with a power source can be derived using the following differential equations for voltage across the capacitor and current through the inductor respectively: iL = C dvC/dt and L diL/dt + R iL= Vsin(ωt)
In the above equations, Vsin(ωt) is the AC voltage of the power source, R is the resistance, L is the inductance, C is the capacitance, t is the time, and ω is the angular frequency.
The solutions of the above equations for state variables Vc and iL can be expressed as follows:
Vc = A sin(ωt + φ)
Vc = (V/R) + Aωcos(ωt + φ),
where A and φ are constants and are determined using the initial conditions and component values assigned to R, L, and C.
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) A paperclip is connected to the table by a string and held suspended in the air by a magnet, as shown in the picture below. (a) Draw force diagrams for the magnet and the paperclip. (b) Identify all of the forces on these force diagrams which are pairs according to Newton's 3rd Law, (c) If the mass of the magnet is 0.3 kg and the force exerted by the hand on the magnet is 3.18 N, what is the magnitude of the force exerted by the magnet on the paperclip? Explain your reasoning.
(a) Force diagrams: Magnet (Gravitational force downward, Magnetic force upward); Paperclip (Tension force upward, Gravitational force downward).
(b) Pairs of forces: Magnet - Gravitational force, Magnetic force; Paperclip - Tension force, Gravitational force.
(c) The force exerted by the magnet on the paperclip is 2.94 N.
(a) The force diagrams for the magnet and the paperclip are as follows:
Force diagram for the magnet:
- Gravitational force (downward)
- Magnetic force (upward)
Force diagram for the paperclip:
- Tension force (upward)
- Gravitational force (downward)
(b) According to Newton's third law, for every action, there is an equal and opposite reaction. In the force diagrams, the pairs of forces are:
- Magnetic force (upward) and Gravitational force on the magnet (downward)
- Tension force (upward) and Gravitational force on the paperclip (downward)
(c) The force exerted by the magnet on the paperclip can be determined using Newton's second law, which states that force (F) equals mass (m) multiplied by acceleration (a), or F = m * a.
In this case, the magnet is not accelerating vertically since it is being held in place by the tension in the string. Therefore, the net force on the magnet in the vertical direction is zero. The forces acting on the magnet are the gravitational force (mg) acting downward and the force exerted by the hand on the magnet (3.18 N) acting upward.
Since the net force is zero, the magnitude of the gravitational force is equal to the magnitude of the force exerted by the hand on the magnet:
mg = 3.18 N
Solving for the force exerted by the magnet on the paperclip, we can set up the equation:
F (magnet on paperclip) - mg = 0
F (magnet on paperclip) = mg
F (magnet on paperclip) = 0.3 kg * 9.8 m/s²
F (magnet on paperclip) = 2.94 N
Therefore, the magnitude of the force exerted by the magnet on the paperclip is 2.94 N. This force balances the gravitational force acting on the paperclip, keeping it suspended in the air.
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write the relation between electerical power engineering , sport
and helth , and mention the referenceses you used ( about 400
word)
Electrical Power Engineering, Sports, and Health: The RelationIn this modern era, electrical power engineering plays a vital role in shaping the sports industry.
From designing sports infrastructure to broadcasting games on television, electrical power engineering is involved in every aspect of sports. Moreover, there is a strong connection between sports and health, and electrical power engineering has made significant contributions to the health sector.
In this essay, we will explore the relation between electrical power engineering, sports, and health with the help of references.The Role of Electrical Power Engineering in SportsThe sports industry relies on electrical power engineering in various ways. For instance, electrical engineers design sports stadiums and arenas, taking into account the structural integrity, lighting, and ventilation, etc. of the venue. The electrical power engineers also install various types of equipment, including audio-visual equipment, scoreboards, electronic screens, cameras, and broadcast equipment, among others.
These systems ensure smooth and safe running of the game and deliver an enhanced experience to the spectators, fans, and viewers worldwide. Moreover, sports broadcasting is a complex field, and electrical power engineers play a crucial role in delivering real-time footage of the game on television, computers, and mobile phones. These are some examples of how electrical power engineering has a relationship with sports.
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