You hold a 4.0-kg computer. A. Determine the magnitude of the torque exerted on

Question

You hold a 4.0-kg computer.

A. Determine the magnitude of the torque exerted on your forearm about the elbow joint caused by the downward force exerted by the computer on the forearm. Let the distance between the center of mass of the computer and your elbow joint be 0.25 m . Ignore the mass of the arm.

B. Determine the magnitude of the torque exerted on your forearm about the elbow joint caused by the upward 340-N force exerted by the biceps muscle on the forearm. Let the biceps muscle be 0.030 m (about 3.0 cm ) from the joint.

Explanation / Answer

given,

mass of the computer = 4 kg

distance of the joint = 0.25 m

torque = force * distance

torque = mass * g * distance

torque = 4 * 9.8 * 0.25

torque = 9.8 Nm

torque due to biceps = 340 * 0.03

torque due to biceps = 10.2 Nm

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