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Suppose a woman does 500 J of work and 9500 J of heat transfer occurs...

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Suppose a woman does 500 J of work and 9500 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) (b) What is her efficiency? (Recall that efficiency is work output/energy input)

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