Chapter 15, Problem 7PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# (a) What is the average metabolic rate in watts of a man who metabolizes 10,500 kJ of feed energy in one day? (b) What is the maximum amount of work in joules he can do without breaking down fat, assuming a maximum eficiency of 20.0%? (c) Compare his work output with the daily output of a 187−W (0.250−horsepower) motor.

(a)

To determine

The average metabolic rate in watts.

Explanation

Given info:

Amount of energy metabolized by man =E=10500Â kJ=10500Ã—1000Â J=10500000Â J

Time period =t=1Â day=24Â hoursÂ =Â 24Ã—3600Â secondÂ =Â 86400Â sec

Average metabolic rate =P

Formula Used:

Metab

To determine

(b)

Maximum amount of work the man can do.

To determine

(c)

Daily work output of motor and compare it with work output of man.

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