IP A person holds a $1\mathrm{.}25$ N baseball in his hand, a distance of $34\mathrm{.}0$ cm from the elbow joint, as shown in the figure$($Figure $1).$ The biceps, attached at a distance of $2\mathrm{.}75$ cm from the elbow, exerts an upward force on the forearm. Consider the forearm and hand to be a uniform rod with a mass of $1\mathrm{.}25$ kg $.$ Suppose the biceps exert just enough upward force to keep the system in static equilibrium.

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