Can someone help me work out this torque problem? Thanks! A person is doing leg

Question

Can someone help me work out this torque problem? Thanks!

A person is doing leg lifts with 3.0-kg ankle weights. She is sitting in a chair with her

legs bent at a right angle initially. The quadriceps muscles are attached to the patella via

a tendon; the patella is connected to the tibia by the patellar tendon, which attaches to

bone 10.0 cm below the knee joint. Assume that the tendon pulls at an angle of 20.0

A person is doing leg lifts with 3.0-kg ankle weights. She is sitting in a chair with her legs bent at a right angle initially. The quadriceps muscles are attached to the patella via a tendon; the patella is connected to the tibia by the patellar tendon, which attaches to bone 10.0 cm below the knee joint. Assume that the tendon pulls at an angle of 20.0 degree with respect to the lower leg, regardless of the position of the lower leg. The lower leg has a mass of 5.0 kg and its center of gravity is 22 cm below the knee. The ankle weight is 41 cm from the knee. If the person lifts one leg, find the force exerted by the patellar tendon to hold the leg at an angle of (a) 30.0 degree and (b) 90.0 degree with respect to the vertical.

Explanation / Answer

The force exerted by the tendon, multiplied by sin 20

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