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23 Nov 2019

During a workout, a person repeatedly lifts a 13 lb barbell through a distance of 1.5 ft. How many "reps" of this lift are required to burn off 125 Cal?

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Jamar Ferry
Jamar FerryLv2
14 Jan 2019

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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A weightlifter has a basal metabolic rate of 80.0W. As he is working out, his metabolic rate increases by about 650W. (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 2.00m (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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