The two links OA and OB are connected by a pin joint at O . If the link OA turns with angular velocity ? 1 rad/s in the clockwise direction and the link OB turns with angular velocity ? 2 rad/s in the 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 lin

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

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