A light rigid rod has a bob of mass m attached to one of its end. The other end of the rod is pivoted so that the entire assembly can rotate freely in a vertical plane. Initially, the rod is held vertical as shown in the figure. From this position it is allowed to fall.(a) When the rod has rotated through theta=30^(@) , what kind of force does it experience– compression or tension? (b) At what value of thetathe compression (or tension) in the rod changes to tension (or compression)?

A light rigid rod has a bob of mass m attached to one of its end. The

1.	A light rigid rod has a bob of mass m attached to one of its end. The other end of the rod is pivoted so that the entire assembly can rotate freely in a vertical plane. Initially, the rod is held vertical as shown in the figure. From this position it is allowed to fall.(a) When the rod has rotated through theta=30^(@) , what kind of force does it experience– compression or tension? (b) At what value of thetathe compression (or tension) in the rod changes to tension (or compression)?
Answer» ANSWER :(a) Compression (B) `theta =COS^(-1)(2/3)`