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goblinko [34]
3 years ago
5

Mechanical efficiency is a comparison of a machines work output with the work input. True or False?

Physics
1 answer:
mr_godi [17]3 years ago
6 0
The answer to this question is true
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A circular loop of flexible iron wire has an initial circumference of 165.0cm, but its circumference is decreasing at a constant
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0.005 V

Explanation:

We are given that

Initial circumference of circular loop=C=165 cm

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We have to find the induced emf at time t=9 s

We know that induced amf,E=\frac{Bd(A)}{dt}

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E=B\frac{d(\pi r^2)}{dt}=B(2\pi r)\frac{dr}{dt}

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Radius of coil at time t=9 s

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1 m=100 cm

E=-0.5(2\pi\times 9.08\times 10^{-2})\times \frac{6\times 10^{-2}}{\pi}=-0.005 V

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