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14. Sources of Energy
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Q50 of 141 Page 14

Pouring dry sand over fire helps to contain it. Explain why?

When sand is poured over fire, the supply of air is cut off and the fire stops. When the supporter of combustion is cut off, then the combustion also stops. Hence we say that pouring dry sand over fire helps to contain it.

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48 The heat produced by burning of cow dung cake of mass 210 g raised the temperature of 50 g of water by 2° C. Assuming that all the heat was utilized for heating water whose specific heat capacity is 4.2 J/g ° C, calculate the calorific value of the dung cake. 49 Explain why is it difficult to burn a wet piece of wood. 51 What is the ultimate source of almost all our sources of energy? 52 Define net energy or useful energy with an example.
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14. Sources of Energy
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