Explanation Section1 : To determine: the change in internal energy for sleeping. Answer : Change in internal energy for sleeping is − 2.3 MJ . Explanation : Given Info : The weight of the man is 65.0 kg . Time of sleeping is 8 h . The metabolic rate for sleeping is 80 J/s . Formula to calculate the change in internal energy is, Δ U = − P ( Δ t ) P is the power or time rate of energy usage Δ t is the time taken for the activity Substitute 80 J/s for P and 8 h for Δ t to find the change in internal energy, Δ U s = − ( 80 J/s ) ( 8 h ) ( 3600 s/h ) = − 2.3 × 10 6 J = − 2.3 MJ Thus, change in internal energy for sleeping is − 2.3 MJ . Section2 : To determine: the change in internal energy for light chores. Answer : Change in internal energy for light chores is − 2.5 MJ . Explanation : Given Info : The weight of the man is 65.0 kg . Time of light chores is 3 h . The metabolic rate for light chores is 230 J/s . Formula to calculate the change in internal energy is, Δ U = − P ( Δ t ) P is the power or time rate of energy usage Δ t is the time taken for the activity Substitute 230 J/s for P and 3 h for Δ t to find the change in internal energy, Δ U l = − ( 230 J/s ) ( 3 h ) ( 3600 s/h ) = − 2.5 × 10 6 J = − 2.5 MJ Thus, change in internal energy for light chores is − 2.5 MJ . Section3 : To determine: the change in internal energy for walking slowly. Answer : Change in internal energy for walking slowly is − 8.3 × 10 5 J . Explanation : Given Info : The weight of the man is 65.0 kg . Time of walking slowly is 1 h . The metabolic rate for light chores is 230 J/s . Formula to calculate the change in internal energy is, Δ U = − P ( Δ t ) P is the power or time rate of energy usage Δ t is the time taken for the activity Substitute 230 J/s for P and 1 h for Δ t to find the change in internal energy, Δ U w = − ( 230 J/s ) ( 1 h ) ( 3600 s/h ) = − 8.3 × 10 5 J Thus, change in internal energy for light chores is − 8

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ISBN: 8220103600385

Author: Vuille

Publisher: Cengage Learning US

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First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of en…

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Chapter 12, Problem 57P

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The change in internal energy for all his activities.

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Chapter 12, Problem 56P

Chapter 12, Problem 58P

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Chapter 12 Solutions

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The change in internal energy for all his activities.

Solution Summary: The author explains that the change in internal energy for all the activities is -6.5MJ.

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