How much work can be obtained from $100$ calories of heat energy?

100 J

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420 J

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42 J

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4200 J

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Solution

The correct option is B $420 J$
$1$ calorie $= 4.2 J$
$∴$ Work done = heat obtained in calories $\times 4.2$
or $w = 100 \times 4.2 = 420 J$

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