Current Attempt in Progress

A man holds a $188-$N ball in his hand, with the forearm horizontal $($see the figure$).$ He can support the ball in this position because of the flexor muscle force vec$(M),$ which is applied perpendicular to the forearm. The forearm weighs $24\mathrm{.}2$ N and has a center of gravity as indicated. Find $($a$)$ the magnitude of vec$(M)$ and the $($b$)$ magnitude and $($c$)$ direction $($as a positive angle counterclockwise from horizontal$)$ of the force applied by the upper arm bone to the forearm at the elbow joint.

$($a$)$ Number

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