Qn A uniform Solid Sphere, placed on top of a spherical dome, rolls down the dome with negligible initial velocity. The sphere sphere start to skid(sliding at the point of contact )when the angle( angle btw the line joining the centre of the dome to the centre of the sphere and the verticle) equal to 30 deg. Calculate the coefficient of static friction between the sphere and the dome. I really do not know how to start. Can comeone please help me?