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Q. 7

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 594

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Short Answer

The power output of a car engine running at is . How much (a) work is done and (b) heat is exhausted per cycle if the engine's thermal efficiency is ? Give your answers in .

(a) Work done per cycle

(b)Heat exhausted per cycle

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Step by Step Solution

Step 1:Definition of thermal efficiency (part a)

The fraction of heat, , converted to work W is denoted by the thermal efficiency, . It is expressed as follows.

The energy input is split between the mechanical energy required to move the car and the heat released into the environment:

2400 rpm per second.

And work per cycle is

Step 2:Explanation (part b)

Thermal efficiency iis the proportion of work gained to energy invested.

As a result, the total energy input per cycle must be

The heat lost during one cycle is equal to the difference between the energy input and the work done:

Step 3:value of work and Heat

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