In a game of football outdoors on a cold day a player will, Ask an Expert

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In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 7.8x105 J of internal energy.

(a) One player, dressed too lightly for the weather, has to leave the game after losing 6.5x105 J of heat. How much work has he done?

(b) Another player, wearing clothes that offer better protection against heat loss, is able to remain in the game long enough to do 2.2x105 J of work. What is the magnitude of the heat that he has lost?

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