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When you bend your knee, the quadriceps muscle is stretched.

This increases the tension in the quadriceps tendon attached to

your kneecap (patella), which, in turn, increases the tension in

the patella tendon that attaches your kneecap to your lower leg

bone (tibia). Simultaneously, the end of your upper leg bone

(femur) pushes outward on the patella. The figure shows how these

parts of a knee joint are arranged.(Figure 1)

http://session.masteringphysics.com/problemAsset/1810391/2/jfk.Figure.05.U32EOC.jpg

Part A

What size force does the femur exerts on the kneecap if the

tendons are oriented as in the figure and the tension in each

tendon is 60 N?

Express your answer using two significant

figures.

F=

Edit
Added Fri, 22 Jul '16
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Solutions
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?F(horiz) = 0

Fh = 60 cos 42 = 44.58

?F(vert) = 0,

Fv = 60 - 60 sin 42 = 60 - 40.148 = 19.85

F = v Fh² Fv² = v 44.58² 19.85² = 48.8

Edit
Added Fri, 22 Jul '16
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