First slide

First law of thermodynamics

Question

If a 5 kg body falls to the ground from a height of 30 m and if all its mechanical energy is converted into heat, the heat produced will be

Easy

A

350 cal
B

150 cal
C

60 cal
D

6 cal

Solution

$\begin{array}{l} dQ = mgh = 5 \times 9 .8 \times 30 = 150 \times 9 .8 joule \\ = 350 cal \end{array}$

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