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Elena-2011 [213]

3 years ago

8

Which component is found only in electric generators and not in electric motors?

2 answers:

Dmitrij [34]3 years ago

7 0

The correct choice is

slip rings

All components are common in AC generator and electric motor except slip rings. In AC generator, the output oscillate between positive and negative values of current and voltage. This is achieved by making the use of slip rings which makes the output voltage and current oscillate.

On the other hand, slip rings are not used in electric motor.

liraira [26]3 years ago

4 0

The answer is D. Slip rings.

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The given parameters:

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The average rate at which the cable does work is calculated as follows;

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Thus, the average rate at which the cable does work is 294,000 J/s.

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Water is flowing in a pipe with a circular cross section but with varying cross-sectional area, and at all points the water comp

slamgirl [31]

(a) 5.66 m/s

The flow rate of the water in the pipe is given by

$Q=Av$

where

Q is the flow rate

A is the cross-sectional area of the pipe

v is the speed of the water

Here we have

$Q=1.20 m^3/s$

the radius of the pipe is

r = 0.260 m

So the cross-sectional area is

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So we can re-arrange the equation to find the speed of the water:

$v=\frac{Q}{A}=\frac{1.20 m^3/s}{0.212 m^2}=5.66 m/s$

(b) 0.326 m

The flow rate along the pipe is conserved, so we can write:

$Q_1 = Q_2\\A_1 v_1 = A_2 v_2$

where we have

$A_1 = 0.212 m^2\\v_1 = 5.66 m/s\\v_2 = 3.60 m/s$

and where $A_2$ is the cross-sectional area of the pipe at the second point.

Solving for A2,

$A_2 = \frac{A_1 v_1}{v_2}=\frac{(0.212 m^2)(5.66 m/s)}{3.60 m/s}=0.333 m^2$

And finally we can find the radius of the pipe at that point:

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