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# BIO Chin-ups. While doing a chin-up, a man lifts his body

ISBN: 9780321675460 31

## Solution for problem 64P Chapter 6

University Physics | 13th Edition

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University Physics | 13th Edition

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Problem 64P

BIO Chin-ups.? While doing a chin-up, a man lifts his body 0.40 m. (a) How much work must the man do per kilogram of body mass? (b) The muscles involved in doing a chin-up can generate about 70 J of work per kilogram of muscle mass. If the man can just barely do a 0.40-m chin-up, what percentage of his body’s mass do these muscles constitute? (For comparison, the ?total percentage of muscle in a typical 70-kg man with 14% body fat is about 43%.) (c) Repeat part (b) for the man’s young son, who has arms half as long as his father’s but whose muscles can also generate 70 J of work per kilogram of muscle mass. (d) Adults and children have about the same percentage of muscle in their bodies. Explain why children can commonly do chin-ups more easily than their fathers.

Step-by-Step Solution:

Solution 64P Step 1 of 4: a)We know that w = mgh w The work per unit mass , m = gh The man does work , 9.8 m/s × 0.4 m = 3.92 J/kg

Step 2 of 4

Step 3 of 4

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BIO Chin-ups. While doing a chin-up, a man lifts his body