Two identical discs of the same radius R are rotating about the axes in opposite directions at the same angular speed ω . The discs are in the same horizontal plane. At the time t=0, the point 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 each period of the rotation (T) of the disc, vr as a function of the time is best represented by

Two identical discs of the same radius R are rotating about the axes i

1.	Two identical discs of the same radius R are rotating about the axes in opposite directions at the same angular speed ω . The discs are in the same horizontal plane. At the time t=0, the point 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 each period of the rotation (T) of the disc, vr as a function of the time is best represented by
Answer» Two identical discs of the same radius $R$ are rotating about the axes in opposite directions at the same angular speed $ω$ . The discs are in the same horizontal plane. At the time $t = 0$ , the point $P$ and $Q$ are facing each other, as shown in the figure. The relative speed between the two points $P$ and $Q$ is $v_{r}$ . In each period of the rotation $(T)$ of the disc, $v_{r}$ as a function of the time is best represented by

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