Inquiry into Physics
Solutions
Inquiry into Physics
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-palter does 1,25 × 105 J of work. (a) Assuming it requires 2.42 × 106J of energy to vaporize one kilogram of perspiration, find the amount of heat transferee 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.
(a)
Amount of heat given out of the athletes body to help him cool down.
Given:
Amount of water evaporated from the athlete’s body =
Heat required to evaporate 1kg of water =
Formula used:
(b)
Change in internal energy of the shot putter during work out.
(c)
Calories to be consumed to regain strength.
Chapter 5 Solutions
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