First slide

Heat engine

Question

What is the maximum amount of work that can be done by extracting 1J of heat energy from a body at temperature 127^oC with an environment at temperature 27^oC ?

Easy

A

1/8 J
B

1/4 J
C

1/2 J
D

3/4 J

Solution

$η_{\max} = 1 - \frac{T_{2}}{T_{1}} = \frac{W}{Q_{1}} \Rightarrow 1 - \frac{300}{400} = \frac{W}{1} \Rightarrow W = \frac{1}{4} J$

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