Posted by **Marcus** on Wednesday, November 28, 2012 at 12:01am.

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.

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