$2\mathrm{.}19$ The cable, whose length is $250$ mm $,$ is fastened to the $500-g$ block. Clock wise rota,

tion of the arm at a constant angular speed of $5ra\frac{d}{s}$ causes the biock slide out,

ward. The motion occurs in the vertical plane, and frictional resistane blockligible,

Determine the tensile force in the cable and the force exerted by the block on the

walls of the groove when $=53\mathrm{.}1301.$