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Question

What will be work done in supplying 400 calories of heat to a system?

A
1672 J
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B
836 J
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C
418 J
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D
209 J
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Solution

The correct option is A 1672 J
Given
Heat supplied (H)=400 calories
Let the work done in supplying heat to the system be W (say)
We know that W=JH, where, J is the mechanical equivalent of heat which has a value 4.18 joules /calorie
W=4.18×400=1672 J
Thus, option (a) is the correct answer.

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