question_answer

 Two links OA and OB are connected by a pin joint at 'O'. The link OA turns with angular velocity \[{{\omega }_{1}}\] radians per second in the clockwise direction and the link OB turns with angular velocity \[{{\omega }_{2}}\] radians per second in the anticlockwise direction. If the radius of the pin at 'O' is 'r' then the rubbing velocity at the pin joint 'O' will be:

A) \[{{\omega }_{1}}.{{\omega }_{2}}.r\]              

B) \[({{\omega }_{1}}-{{\omega }_{2}})r\]

C) \[({{\omega }_{1}}+{{\omega }_{2}})r\]                       

D) \[({{\omega }_{1}}+{{\omega }_{2}})2r\]