Answered: Humerus Biceps 12.6 N Radius Ulna Mg…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter26: Image Formation By Mirrors And Lenses

Section: Chapter Questions

Problem 9CQ

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Question

A person holds a 1.42 Newton baseball in his hand, a distance of 34 cm from the elbow joint, as shown in the image attached. The biceps, atttached at a distance of 2.75 cm from the elbow, exerts an upward force of 12.6 Newtons on the forearm. Consider the forearm and hand to be a uniform rod with a mass of 1.2 kg.

A.) Calculate the net torque acting on the forearm and hand. Use the elbow joint as the axis of rotation.

B.) If the net torque obtained in part (a) is nonzero, in which direction will the forearm and hand rotate?

C.) Would the torque exerted on the forearm by the biceps increase or decrease if the biceps were attached farther from the elbow joint?

Humerus
Biceps
12.6 N
Radius
Ulna
Mg
2.75 cm
17.0 cm
17.0 cm

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