A uniform solid disk of mass and radius spins freely at

PHYSICS · Subjective · A Level · Physics · Engineering physics · Engineering physics

Problem

A uniform solid disk of mass 2.0 kg2.0\,\text{kg} and radius 0.50 m0.50\,\text{m} spins freely at 10 rad s−110\,\text{rad}\,\text{s}^{-1}. A 0.20 kg0.20\,\text{kg} lump of clay stuck to the rim is slowly moved to the disk’s center without external torque. Calculate the work that must be done to move the clay (in joules).

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