Question

if a car engine has a thermal efficiency of 40% and it does 400 j of work in one cycle, how much energy input does it require each cycle?

Answer 1

By calculating thermal efficiency, the input energy is 10,000 joule.

We need to know about the thermal efficiency to solve this problem. Thermal efficiency is the ratio of work done by the machine to input energy. It can be determined as

η = W / Qinp

where η is thermal efficiency, W is work and Qinp is input energy.

From the question above, we know that:

η = 40%

W = 400 J

By substituting the following parameter, we get

η = W / Qinp

40% = 400 / Qinp

Qinp = 400 x 100/40

Qinp = 10,000 joule

Hence, the input energy of a car engine is 10,000 joule.

For more on thermal efficiency at: brainly.com/question/24159924

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