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A solid $1040$ hot$-$rolled steel shaft $38\mathrm{.}5$ in long has a rectangular cross section of $2\mathrm{.}5$ in $3\mathrm{.}6$ in$.$ The shaft transmits a torque of $32$kip.in at an angular velocity of $510rpm.$

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Determine the total angle of twist of the shaft.

The total angle of twist of the shaft is $".$ Please help asap thank you