Question

The upper leg muscle (quadriceps) exerts a force of FQ=1390 N


Problem 10: 

The upper leg muscle (quadriceps) exerts a force of FQ=1390 N, which is carried by a tendon over the kneecap (the patella) at the angles shown in the figure. 

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Part (a) Find the magnitude of the force, in newtons, exerted by the kneecap on the upper leg bone (the femur) at the point P.  

Part (b) What angle does the force from the kneecap act at, in degrees measured counterclockwise from the positive x-direction shown in the figure? 

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