1. Usain Bolt used 850 kcal on a long walk. Calculate the energy he used for the walk in the following units:
(a) Joules
(b) Kilojoules
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3. How many kilocalories are lost when 580-g of water cools from 67oC to 22oC?
4. In a freezer, 160-g of water at 0oC is placed in an ice cube tray. How much heat, in kilocalories, must be removed to form ice cubes at 0oC?
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1. Usain Bolt used 850 kcal on a long walk. Calculate the energy he used for the walk in the followi...
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