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Problem $12\mathrm{.}069-$ A block sliding inside a slot

A $0\mathrm{.}5-kg$ block $B$ slides without friction inside a slot cut in arm $OA$ which rotates in a vertical plane. The rod has a constant

angular acceleration ${}^{}=10ra\frac{d}{s^2}.$ Know that when $=72$ and $r=0\mathrm{.}8m,$ the velocity of the block is zero.

Problem $12\mathrm{.}069.$b $-$ Force exerted on the block by the arm

Determine the force exerted on the block by the arm at this instant. $($Round the final answer to three decimal places.$)$

The force exerted on the block by the arm is

N $.$A $0\mathrm{.}5-$kg block B slides without friction inside a slot cut in arm OA which rotates in a vertical plane. The rod has a constant angular acceleration $\backslash$theta $=10$ rad$/$s$2$

$.$ Know that when $\backslash$theta $=72$

and r$=0\mathrm{.}8$ m

$,$ the velocity of the block is zero.