(Solved): The coefficient of static friction \mu _(5) between the 127-lb body and the 17\deg wedge is 0.28 . D ...

The coefficient of static friction \mu _(5) between the 127-lb body and the 17\deg wedge is 0.28 . Determine the magnitude of the force P required to begin raising the 127-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the rollers are removed and the coefficient of static friction \mu _(5)=0.28 applies at this surface as well.