Heat engines take input energy in the form of heat, use some of that energy to d

Question

Heat engines take input energy in the form of heat, use some of that energy to do work, and exhaust the remainder. Similarly, a person can be viewed as a heat engine that takes an input of internal energy, uses some of it to do work, and gives off the rest as heat. Suppose a trained athlete can function as a heat engine with an efficiency of 0.18. (a) What is the magnitude of the internal energy that the athlete uses in order to do 9.8x104 J of work? (b) Determine the magnitude of the heat the athlete gives off.

Both answers should be in J please!

Explanation / Answer

Efficiency = Work Done/ Energy Absorbed Energy Absorbed = Work Done/ Efficiency = 9.8 * 10^4 J /0.18 = 54.44 * 10^4 J Magnitude Of Heat Lost = Energy Absorbed - Work Done = (54.44-9.8)* 10^4 J = 44.67 * 10^4 J

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