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NeX [460]
3 years ago
7

A machine can never be 100% efficient because some work is always lost due to what?

Physics
2 answers:
katrin [286]3 years ago
8 0

A machine can never be 100% efficient because some work is always lost due to the lack of materials or equipment that would convert work by 100%. It follows the second law of entropy. The ideal engine is known as Carnot’s engine having a 100% efficiency. So far, no engine has ever gotten to 100%.

kari74 [83]3 years ago
8 0

Answer:

Friction

Explanation:

Ik cuz i took tha test, i wouldn't lie to fellow students <3

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How much energy becomes unavailable for work in an isothermal process at 440 k, if the entropy increase is 25 j/k?
just olya [345]
Answer: 11,000 J

Explanation:

In an isothermal process,

\text{entropy increase} =  \frac{\text{amount of energy in heat transfer}}{\text{temperature} }  (1)

Note that, the energy used in heat transfer is not available for work. So, the amount of energy unavailable for work is equal to the energy used in heat transfer.

To obtain the amount of energy in heat transfer, we multiply both sides of equation (1) by the denominator of the right side of (1) so that 

amount of energy in heat transfer = (entropy increase)(temperature)
                                                      = (25 J/K)(440 K)
                                                      = 11,000 J

Since the amount of energy unavailable for work is equal to the amount of energy in the heat transfer, therefore the amount of energy unavailable for work is 11,000 J.
8 0
3 years ago
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ANEK [815]

Answer:

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Explanation:

5 0
3 years ago
A piece of plastic has a net charge of +9.9 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60
Leto [7]

Answer:

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Explanation:

Given that,

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We know that,

formula of charge

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Where,

Q = total charge

n = number of protons

e = charge of electron

Put the value into the formula

n = \dfrac{Q}{e}

n=\dfrac{9.9\times10^{-6}}{1.6\times10^{-19}}

n=6.1875\times10^{13}\ C

According to statement of question

Divide the answer by 10^{13}

n=\dfrac{6.1875\times10^{13}}{10^{13}}

n=6.19\ C

Hence, The number of protons 6.19 more than electron.

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Answer:

Explanation:

The answer is D- The number of flies decreased, then leveled off.

6 0
2 years ago
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Varvara68 [4.7K]
The answer would be A, transverse.
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