This problem must be solved using regular ol Newton's $2$ nd Law

For the shown crank slider in the given configuration, solve for the minimum torque T$12$ that must be applied to crank $2$ to maintain static equilibrium against $P=0\mathrm{.}9kN.$

Figure P$11\mathrm{.}2R_{A{O}_2}=75mm$ and $R_{BA}=350mm.$