This muscle length to force relationship can be demonstrated bydoing a chin-up.

Question

This muscle length to force relationship can be demonstrated bydoing a chin-up. As you hang from the bar, your biceps muscles arestretched and can produce only a relatively small force. As you getclose to the bar, your biceps muscles contract substantially, andyou again experience difficulty. The easiest part of the chin-upoccurs somewhere in between, when your muscles are close to theirnatural length.

Imagine hanging from a chin-up bar and beginning a chin-up.Which of the following velocity versus time graphs best representsthe first part of your motion (from being at rest to beingapproximately halfway to the bar)? Assume you are trying to do thechin-up as quickly as possible.

Go to website to see picture.

http://session.masteringphysics.com/problemAsset/1011360/12/1011360.jpg

The answer is either A B C D E

Explanation / Answer

C

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