An annealed copper strip $225$ mm $(9$ in$.)$ wide and $25$ mm $(1\mathrm{.}00$ in $.)$ thick is being rolled

to a thickness of $.)$ in one pass. The roll radius is $300$ mm $(12$ in $.),$ and the

rolls rotate at $100$ rpm $.$ Calculate the roll force and the power required in this operation.

Use figure below to calculate trues stress.