Two identical discs of same radius R are rotating about their axes in...
Two identical discs of same radius R are rotating about their axes in opposite directions with the same constant angular speed ω. The discs are in the same horizontal plane. At time t=0, the points P and Q are facing each other as shown in the figure. The relative speed between the two points P and Q is vr. In one time period (T) of rotation of the discs, vr as a function of time is best represented by


Solution:
At t=0,t=T2 and t=T therelative velocity will bezero. At t=T4 and t=3T4, the relative velocity will be maximum in magnitude
Hence graph (a) correctly depicts vr versus t graph.
Hence graph (a) correctly depicts vr versus t graph.
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