Question

A man holds a 178-N ball in his hand, with the forearm horizontal (see the drawing). He can support the ball in this position because of the flexor muscle force $\overline{\mathbf{M}},$ which is applied perpendicular to the forearm. The forearm weighs 22.0 $\mathrm{N}$ and has a center of gravity as indicated. Find $\quad(\mathrm{a})$ the magnitude of $\overrightarrow{\mathbf{M}}$ and $(\mathbf{b})$ the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint.

          A man holds a 178-N ball in his hand, with the forearm horizontal (see the drawing). He can
support the ball in this position because of the flexor muscle force $\overline{\mathbf{M}},$ which is applied perpendicular to the forearm. The forearm weighs 22.0 $\mathrm{N}$ and has a center of gravity as indicated. Find $\quad(\mathrm{a})$ the magnitude of $\overrightarrow{\mathbf{M}}$ and $(\mathbf{b})$ the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint.

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Added by Stephanie H.

Physics

John D. Cutnell, Kenneth W. Johnson 9th Edition

Chapter 9

Instant Answer

Solved by Expert Donald Albin

08/09/2021

Step 1

Include the weight of the ball (178 N) acting downward at the center of the ball, the weight of the forearm (22 N) acting downward at the center of gravity of the forearm, the flexor muscle force $\overrightarrow{\mathbf{M}}$ acting perpendicular to the forearm, Show more…

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A man holds a 178-N ball in his hand, with the forearm horizontal (see the drawing). He can support the ball in this position because of the flexor muscle force $\overline{\mathbf{M}},$ which is applied perpendicular to the forearm. The forearm weighs 22.0 $\mathrm{N}$ and has a center of gravity as indicated. Find $\quad(\mathrm{a})$ the magnitude of $\overrightarrow{\mathbf{M}}$ and $(\mathbf{b})$ the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint.

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