Question: A variable force F is maintained tangent to a frictionless, semicircular surface (Fig. 7 AI). By slow variations in the force a block with weight

A variable force F is maintained tangent to a frictionless, semicircular surface (Fig. 7 AI). By slow variations in the force a block with weight w is moved, and the spring to which it is attached is stretched from position 1 to position 2. The spring has negligible mass and force constant k. The end of the spring moves in an arc of radius a. Calculate the work done by the force F.

A variable force F is maintained tangent

2 dt Unstrctched cngth

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