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2 years ago

Why is the work output always less than the work input?

Physics

2 answers:

Elena L [17]2 years ago

8 0

Because energy is wasted either in the form of heat energy or something else (like friction)

Georgia [21]2 years ago

5 0

Because of energy loses. Energy is lost as heat or sound etc, the system is not 100% efficient. Also as work done= force *the distance the force is applied, because of the friction force, the actual force that is applied is reduced, thus the value for the work done (change in energy) becomes less.

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The peak value of an alternating current in a 1500-W device is 6.4 A. What is the rms voltage across it

horrorfan [7]

Answer:

6787.5 V

Explanation:

From the question,

P = IV..................... Equation 1

Where P = Power, I = rms current, V = rms voltage.

make V the subject of the equation

V = P/I................. Equation 2

Given: P = 1500 W, I = 6.4/√2 = 4.525 A

Substitute these values into equation 2

V = 1500(4.525)

V = 6787.5 V

Hence the rms voltage = 6787.5 V

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vaieri [72.5K]

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bonufazy [111]

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he membrane that surrounds a certain type of living cell has a surface area of 6.0 x 10-9 m2 and a thickness of 1.6 x 10-8 m. As

k0ka [10]

Answer:

$1.54481175\times 10^{-12}\ C$

Explanation:

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Charge is given by

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