A uniform solid disk with a mass of 43.8 kg and a radius of 0.823 m is free to rotate about a frictionless axle. Forces of 90.0 and 125 N are applied to the disk, as the figure illustrates. Taking the clockwise direction to be the negative direction, what is (a) the net torque produced by the two forces and (b) the angular acceleration of the disk?

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A uniform solid disk with a mass of 22.8 kg and a radius of 0.633m is free to rotate about a frictionless axle. Forces of 90.0 and 125 N are applied to the disk, as the figure illustrates (picture has the 125 N pointing to the right, on the horizontal, from the very top edge of the circle, at 90 degrees whereas the 90 N points to the right, on the horizontal, from the very bottom edge of the circle, at 90 degrees. Taking the clockwise direction to be the negative direction, what is (a) the net torque produced by the two forces and (b) the angular acceleration of the disk?

Disk A, with a mass of 2.0 kg and a radius of 70 cm, rotates clockwise about a frictionless vertical axle at 50 rev/s. Disk B, also 2.0 kg but with a radius of 60 cm, rotates counterclockwise about the same axle, but at a greater height than disk A, at 50 rev/s. Disk B slides down the axle until it lands on top of disk A, after which they rotate together. After the collision, what is their common angular speed (in rev/s) and in which direction do they rotate?

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Two uniform disks are mounted (like merry-go-round) on frictionless bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with mass M and radius R is set spinning clockwise at angular speed of Wo. The second disk, with mass 3M and Radius R/2 is set spinning counterclockwise with the sample angular speed of Wo. They then coupld together. (the rotaional inertia of a disk is mr^2/2). What is their angular speed and direction of rotation after coupling? How much is the energy loss of the two-disk system caused by such coupling?

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