In a game of football outdoors on a cold day, a player will begin to feel exhaus

Question

In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 8.0 x 10^5 J of internal energy, (a) One player, dressed too lightly for the weather, has to leave the game after losing 6.4 x 10^5 3 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 2.9 x 1o^5 J of work. What is the magnitude of the heat that he has lost? Number units Number units

Explanation / Answer

From 1st law of thermodynamics, we can say that, dq+dw=dU where
dq is change in heat,dw is change in work, and dU is change in total internal energy.
Also it is given in question that,dU= 8* 10^5 J

a) Work done, dw= dU-dq
So, dw= 8*10^5 - 6.4*10^5 = 1.6*10^5 J

b) Magnitude of heat lost by player,dq= 8*10^5 - 2.9*10^5 = 5.1*10^5 J.

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