The chin-up is one exercise that can be used to strengthen the biceps muscle. Th

Question

The chin-up is one exercise that can be used to strengthen the biceps muscle. This muscle can exert a force of approximately 800 N as it contracts a distance of 7.4 cm in a 72-kg male. How much work can the biceps muscles (one in each arm) perform in a single contraction? J Compare this amount of work with the energy required to lift a 72-kg person 40 cm in performing a chin-up. How much is required? J Do you think the biceps muscle is the only muscle involved in performing a chin-up? Yes No Explain.

Explanation / Answer

Wb = F * y

Wg = F * y

two biceps

Wb = 2(F * y)

= 2 * 800 * 0.074

= 118.4 J

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Wg = (72 kg)(9.8)(0.40)

= 282.24

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282.24 J > 118.4 J

we could create energy by clossing pullups

No, biceps muscle is not the only muscle involved in performing a chin up

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