The patellar tendon attaches to the tibia at the tibial, Ask an Expert

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The patellar tendon attaches to the tibia at the tibial tuberosity. The tibial tuberosity is 8 cm from the center of the knee joint. The patellar tendon pulls at an angle of 30° to the tibia. If the patellar tendon produces an extension torque around the knee joint equal to 400 N·m, how large is the force in the patellar tendon?

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