College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A weightlifter has a basal metabolic rate of 80.0 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450-Calorie bagel if he stays in bed all day? (b) How long does it take him if he’s working out? (c) Calculate the amount of mechanical work necessary to lift a 120-kg barbell 2.00 m. (d) He drops the barbell to the floor and lifts it repeatedly. How many times per minute must he repeat this process to do an amount of mechanical work equivalent to his metabolic rate increase of 650 W during exercise? (e) Could he actually do repetitions at the rate found in part (d) at the given metabolic level? Explain.


To determine
how many hours are needed to work off the energy if he stays in bed all day.


Given Info:

The basal metabolic rate of the weightlifter is 80.0W .

The calorie to be work off is 450.0calorie

Formula to calculate the volume time taken is,


  • ΔU is the energy used
  • P is the power.

Substitute 450.0calorie for ΔU and 80.0W for P to find the time taken,



To determine
how long does it take if he is working out.


To determine
The amount of mechanical work necessary to lift the barbell.


To determine
the number of baseball lift in one minute.


To determine
whether he can do repetitions at the rate found in (d) at the given metabolic level.

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