The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the anti-clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

The two links OA and OB are connected by a pin joint at O. If the link

1.	The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the anti-clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
A.	ω1.ω2.r
B.	( ω1 - ω2)r
C.	( ω1 + ω2)r
D.	( ω1 - ω2)2r
Answer» D. ( ω1 - ω2)2r

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