Heat required to melt $1 g$ ice at $0^{o} C$ is $80 c a l$ . A man chews $60 g$ of ice and melt it in one minute. His power of chewing is

480 W

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20160 W

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2016 W

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336 W

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Solution

The correct option is B $336 W$
Heat required to melt 60 g of ice = 8060 cal = 8060*4.2 J =20160 J
Power = Energy/ time = 20160 J/60 s = 336 W

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