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06-04-2017
Physics

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By how much does the temperature of mercury increase? the specific heat of mercury is 140

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06-04-2017

Heat energy = 140 J = 20/1000 * sp.heat * ( change in temp.)
= 20/1000 * 139 * temp. increase
= 2.78 * temp. incr.
Increase in temp = 100/2.78 = 35.97 K.
to raise the temp.of 20 g of water by 35.97 K
= 20/1000 * 4186 * 35.97
= 3011.5 J

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