An athlete training for an event does 5.53 104 J of work during a workout and gi

Question

An athlete training for an event does 5.53 104 J of work during a workout and gives off 3.17 105 J of heat. Consider the athlete to be like a heat engine. (a) Determine the magnitude of the change in internal energy of the athlete. J
(b) What is his efficiency? % An athlete training for an event does 5.53 104 J of work during a workout and gives off 3.17 105 J of heat. Consider the athlete to be like a heat engine. (a) Determine the magnitude of the change in internal energy of the athlete. J
(b) What is his efficiency? % An athlete training for an event does 5.53 104 J of work during a workout and gives off 3.17 105 J of heat. Consider the athlete to be like a heat engine. (a) Determine the magnitude of the change in internal energy of the athlete. J
(b) What is his efficiency? %

Explanation / Answer

a) |E| = output work + output heat = 5.53e4J + 31.7e4J = 3.723e5 J

b) input = 3.723e5 J
output = 5.53e4 J
eff = output/input * 100% = 14.85%

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