Discs A and B each have a rotational inertia about the central axis of 0.300 kg m?, a radius of 20.0 cm, and can freely rotate around the center rods passing through these two discs, in the same direction around the rods.

Discs A and B each have a rotational inertia about the central axis of 0.300 kg m, a radius of 20.0 cm, and can freely rotate around the center rods passing through these two discs, in the same direction around the rods. Each was rolled up to turn and pulled for 10.0 s. (The string falls off the end) The magnitude of the force pulling the string is 30.0 N for Disc A and 20.0 N for Disc B. After falling off, the disks collide and have the same final angular velocity at 6.00 s due to the friction between them. (a) What is the average amount of friction torque that caused the final angular velocity to be reached? (b) What is the loss of kinetic energy when torque acts on these plates? (c) Where did "Lost Energy" go?

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genius_generous answered 2 years ago

The parallel axis theorem relates Icm, the moment of inertia of an object about an axis passing through its center of m...

The parallel axis theorem relates Icm, the moment of inertia of an object about an axis passing through its center of mass, to Ip, the moment of inertia of the same object about a parallel axis passing through point p. The mathematical statement of the theorem is Ip=Icm+Md2, where d is the perpendicular distance from the center of mass to the axis that passes through point p, and M is the mass of the object. Part A Suppose a uniform slender rod...

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Discs A and B each have a rotational inertia about the central axis of 0.300 kg m?, a radius of 20.0 cm, and can freely rotate around the center rods passing through these two discs, in the same direction around the rods.

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The parallel axis theorem relates Icm, the moment of inertia of an object about an axis passing through its center of m...