The chin - up is one exercise that can be used tostrengthen the biceps muscle. This muscle can exert a forceof approximately 8.00 x 102 N as it contracts a distance of7.5 cm in a 75 - kg male.3 (a) How much work can the bicepsmuscles (one in each arm) perform in a single contraction?(b) Compare this amount of work with the energy requiredto lift a 75 - kg person 40. cm in performing a chin - up. (c) Doyou think the biceps muscle is the only muscle involved in performinga chin - up?

Question
Asked Dec 17, 2019
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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 x 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?

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Expert Answer

Step 1

a)

the work done is the product of force and distance\displacement in the direction of force.

the expression for work done  as it happends on two arms is 

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W = 2Fd

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Step 2

substitute the known values in the above equation ,

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(10-²m W = 2(8.00×10² N)(7.5cm) 1cm = 120J

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Step 3

b)

the work done to lif...

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W'=mgh

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