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Problem $16\mathrm{.}076-$ A loaded uniform slender rod

A uniform slender rod of length $L=1,100mm$ and mass $m=5\mathrm{.}0kg$ is suspended from a hinge at $C.$ A horizontal force P of magnitude $75$ N is applied at end $B.$

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Problem $16\mathrm{.}076.$a $-$ Angular acceleration of the rod

Determine the angular acceleration of the rod.

The angular acceleration of the rod is $ra\frac{d}{s^2}.$