A rope of negligible mass is wrapped around a 225 kg solid, Ask an Expert

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Q1. A 1300 {rm kg} wrecking ball hangs from a 30 {rm m}-long cable. The ball is pulled back until the cable makes an angle of 24.0^circle with vertical. By how much has the gravitational potential energy of the ball changed?

Q2. A rope of negligible mass is wrapped around a 225 kg solid cylinder of radius 0.40 m. The cylinder is suspended some meters off the ground with its axis oriented horizontally, and turns on that axis without friction.

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