ممكن تساعدوني في حل هذا السؤال ضروري جدا جدا
 

ممكن تساعدوني في حل هذا السؤال ضروري جدا جدا

A wheel of mass M, radius of gyration K, spins smoothly on a fixed horizontal axle of radius (a) which passes slightly larger radius at the hub of the wheel. The coefficient of friction between the bearing surfaces is mu. If the wheel is initially spinning with angular velocity (omega) find the time and the number of turns that it takes to stop???