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During a workout, a shot-putter loses 0.175 kg of water through evaporation. The heat required to produce the evaporation (a phase change from liquid water to water vapor) comes from the athlete's body. During his exercise, the shot-putter does 1 . 25 × 10 5 J of work. (a) Assuming it requires 2 . 42 × 10 6 J of energy to vaporize one kilogram of perspiration, find the amount of heat transferred from the athlete to evaporate the sweat and to help cool him. (b) Find the change in the internal energy of the shot-putter during his workout. (c) Determine the minimum number of food Calories that must be consumed to replace this loss of internal energy.

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Inquiry into Physics

8th Edition
Ostdiek
Publisher: Cengage
ISBN: 9781337515863
Chapter 5, Problem 3C
Textbook Problem

During a workout, a shot-putter loses 0.175 kg of water through evaporation. The heat required to produce the evaporation (a phase change from liquid water to water vapor) comes from the athlete's body. During his exercise, the shot-putter does 1 . 25 × 10 5 J of work.

(a) Assuming it requires 2 . 42 × 10 6 J of energy to vaporize one kilogram of perspiration, find the amount of heat transferred from the athlete to evaporate the sweat and to help cool him.

(b) Find the change in the internal energy of the shot-putter during his workout.

(c) Determine the minimum number of food Calories that must be consumed to replace this loss of internal energy.

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