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Question of the Day: AP Physics 1

Consider the following system:

 

Spinning rod with masses at end

Two spherical masses, A and B, are attached to the end of a rigid rod with length l. The rod is attached to a fixed point, p, which is at the midpoint between the masses and is at a height, h, above the ground. The rod spins around the fixed point in a vertical circle that is traced in grey.  is the angle at which the rod makes with the horizontal at any given time ( in the figure).

The rod is initially at rest in its horizontal position.  of work were applied toward rotating the rod. When the rod passes through its horizontal position now, what is the instantaneous linear velocity of mass A? 

Neglect air resistance and any internal friction forces.

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