Question

a rigid goal frame of mass 100kg consists of two identical posts. P1 and P2 and a uniform crossbar. when the frame is placed in suitably constructed holes in a playing field, the posts are vertical and the cross bar is horizontal. The contact forces on the frame which are assumed to act vertically at the base of holes, have magnitudes R1 Newtons and R2 newtons as indicated in the diagram. state the value of R1. A goal keeper of mass 70kg hangs by one hand, without moving, from a point of the cross bar 2 m from the corner where p1 meets the cross bar. given that the length of the cross bar is 7m. calculate the new values of R1 and R2