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A body absorbs 1000 calories of heat when it is heated from $20 ° C to 7 0 ° C .$ The water equivalent of that body is

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20 g

25g

15g

10 g

answer is B.

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Detailed Solution

Q = 1000 cal, Δ t = 70 - 20 = 50 ° C

$W = ?$

$W = ms, Q = ms Δ t$

$ms = \frac{Q}{Δ t} = \frac{1000}{50} = 20 g$

$\begin{matrix} w = ms = 20 g \end{matrix}$

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