If you hold your arm outstretched with palm upward, as in Figure P8.12, the force to keep
Question:
If you hold your arm outstretched with palm upward, as in Figure P8.12, the force to keep your arm from falling comes from your deltoid muscle. The arm of a typical person has mass \(4.0 \mathrm{~kg}\) and the distances and angles shown in the figure.
a. What force must the deltoid muscle provide to keep the arm in this position?
b. By what factor does this force exceed the weight of the arm?
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The deltoid muscle plays a crucial role in holding your arm outstretched To understand the force it ...View the full answer
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Related Book For 
College Physics A Strategic Approach
ISBN: 9780321907240
3rd Edition
Authors: Randall D. Knight, Brian Jones, Stuart Field
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