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Latent Heat of Fusion

A boy chews ...

Question

A boy chews $100 g$ of ice-cream in $5$ minutes. If latent heat of ice $80 c a l / g m$ , his power is

A

56 W

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B

28 W

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C

112 W

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D

224 W

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Solution

The correct option is C $112 W$
Total energy $80 \times 100 c a l = 80000 \times 4.2 = 336 K J$
Power $= \frac{336}{5 \times 60} = 112 W$

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