Question

What is the magnitude of the resultant joint reaction force (JRF) in newtons (N) if the dumbbell acts at 0.333 m and the biceps acts at 0.026 m? Assume the dumbell is still 20 kg and the COM of the arm creates the same torque. (Hint: Find the Force of biceps tendon first) Assuming that the mass of the arm is 5 kg and acts 0.15 m from the joint, and the biceps tendon acts at a distance of 0.029 m from the joint,

Under different conditions during the same maneuver, the triceps tendon contracted with a vertical force of 379.4 N at a distance of 0.006 m from the joint. Meanwhile, the biceps tendon contracted with a force of 2054 N at a distance of 0.020 m from the joint center. If the centre of mass (5 kg) acts at the same distance of .15 m and the dumbbell is 0.295 m from the joint center, what mass is the subject lifting in kilograms (kg)?

Answer 1