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 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 ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ 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.	ω₁.ω₂.r
B.	(ω₁ - ω₂)r
C.	(ω₁ + ω₂)r
D.	(ω₁ - ω₂)2r
Answer» C. (ω₁ + ω₂)r

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