You decide to use your body as a Carnot heat engine. The operating gas is in a t

Question

You decide to use your body as a Carnot heat engine. The operating gas is in a tube with one end in your mouth (where the temperature is 37.0) and the other end at the surface of your skin, at 30.0. Suppose you want to use this human engine to lift a 2.25 box from the floor to a tabletop 1.30 above the floor. How much heat input is needed to accomplish this? How many 350 (those are food calories, remember) candy bars must you eat to lift the box in this way? Recall that 80.0 of the food energy goes into heat

Explanation / Answer

efficiency=1-30/37=.19 energy required=2.25*9.8*1.3=28.665J => energy with less efficiency required=150.86J n=150.86*5/350/4.2 so he has to eat .51 candy bars or it may be taken as 1 bar

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