   Chapter 5, Problem 27P

Chapter
Section
Textbook Problem

The chin-up is one exercise that can be used to strengthen the biceps muscle. This muscle can exert a force of approximately 8.00 × 102 N as it contracts a distance of 7.5 cm in a 75-kg male.3 (a) How much work can the biceps muscles (one in each arm) perform in a single contraction? (b) Compare this amount of work with the energy required to lift a 75-kg person 40. cm in performing a chin-up. (c) Do you think the biceps muscle is the only muscle involved in performing a chin-up?

(a)

To determine
The work that the biceps muscle in each arm can perform in a single contraction.

Explanation

Given Info:

The force that the biceps muscle can exert is 8.00×102N .

The distance contracted in the exercise is 7.5cm .

The mass of the person is 75.0kg .

Formula to calculate the total work done by the two biceps muscle is,

Wbiceps=2(FΔx)

• Δx is the distance contracted in the exercise
• F is the force that the biceps muscle can exerts

Substitute 8.00×102N for F and 7

(b)

To determine
The total energy required to lift a 75kg person to 40.0cm in performing a chin-up.

(c)

To determine
whether other muscles than biceps are involved in chin-up.

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