1.

A uniform solid disk is set into rotation with an angular speed about an axis through its center. While still rotating at this speed, the disk is placed into contact with a horizontal surface and released, as shown in Figure 11.64. (a) What is the angular speed of the disk once pure rolling takes place? (b) Find the fractional loss in kinetic energy from the time the disk is released until the time pure rolling occurs. (Hint: Consider torque about the center of mass.)

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