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Q.

Latent heat of ice is $80$ calorie/gm. A man melts $60$ g of ice by chewing in $1$ minute. His power is:

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a

$336 W$

b

$1.33 W$

c

$0.75 W$

d

$4800 W$

answer is B.

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Detailed Solution

Work done by man $=$ Heat absorbed by ice $= m L = 60$ $\times 80 = 4800 c a l o r i e$ $= 20160 J$

Power $= \frac{W}{t} = \frac{20160}{60} = 336 W$

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