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 ∘C) and the other end at the surface of your skin, at 30.0 ∘C. What is the maximum efficiency of such a heat engine? e = 2.3 % Suppose you want to use this human engine to lift a 3.50 kg box from the floor to a tabletop 1.20 m above the floor. How much must you increase the gravitational potential energy? U = 41.2 J How much heat input is needed to accomplish the lift?    How many 350 calorie (those are food calories, remember) candy bars must you eat to lift the box in this way? Recall that 80% of the food energy goes into heat. Express your answer using two significant figures.

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