-14- N17/4/PHYSI/HP3/ENG/TZO/XX Option B Engineering physics 9. - A hoop of mass m, radius r and moment of inertia mr rests on a rough plane inclined at an angle to the horizontal. It is released so that the hoop gains linear and angular acceleration by rolling, without slipping, down the plane. hoop Im r Imr | wx = 0 emg I a 0 (a) On the diagram, draw and label the forces acting on the hoop. (b) Show that the linear acceleration a of the hoop is given by the equation shown. a= gxsing 2 Trinomg. my 1.M.a. 1. M. a. nom xa a = sinorg.