Question: A (30-mathrm{kg}) solid sphere of radius (0.12 mathrm{~m}) is rolling without slipping on a horizontal surface at (2.0 mathrm{~m} / mathrm{s}). (a) What average torque
A \(30-\mathrm{kg}\) solid sphere of radius \(0.12 \mathrm{~m}\) is rolling without slipping on a horizontal surface at \(2.0 \mathrm{~m} / \mathrm{s}\).
(a) What average torque is required to stop the sphere in \(5.0 \mathrm{rev}\) without inducing skidding?
(b) If this torque is caused by a soft braking bumper that is lowered down until it just makes contact with the top of the sphere, what is the magnitude of the frictional force between bumper and sphere?
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a To stop the sphere without inducing skidding we need to apply a torque that will decelerate the rotation of the sphere while keeping its linear velocity constant The angular deceleration of the sphe... View full answer
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