Question
Asked Sep 26, 2019
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In order to prevent muscle contraction from misaligning bones during healing (which can cause a permanent limp), injured or broken legs must be supported horizontally and at the same time kept under tension (traction) directed along the leg. One version of a device to accomplish this aim, the Russell traction apparatus, is shown in the figure. This system allows the apparatus to support the full weight of the injured leg and at the same time provide the traction along the leg.

If the leg to be supported weighs 45.0 N , what must be the weight of W?

What traction force does this system produce along the leg?

,25°
25
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,25° 25

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Expert Answer

Step 1

In order to maintain equilibrium, weight of W must be equal to weight of the leg. Therefore, W = 45.0 N.

Step 2

Using Newton’s second law...

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F T cos 25°+T cos 25° =2 (45.0 N) (cos 25°) =81.6N

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