Question: A uniform solid disk is set into rotation with an angular speed i about an axis through its center. While still rotating at this speed,

A uniform solid disk is set into rotation with an angular speed ώi 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 in Figure P11.56.
(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 pure rolling occurs. (Hint: Consider torques about the center of mass.)

A uniform solid disk is set into rotation

Figure P11.56 Problems 56 and 57

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