Physics Help Forum Rigid Bodies Kinematics Question

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Dec 15th 2008, 12:02 AM #1 Junior Member   Join Date: Dec 2008 Posts: 1 Rigid Bodies Kinematics Question The answers are handwritten. So far I have: Since the direction of the velocity of A is in the j direction, and the velocity of B is in the -i direction, the instantaneous centre of rotation is C. Is this a correct method? Since C is the instantaneous centre of rotation, Speed of B: V_B=(BC)w= 6 m/s Speed of A: V_A=(AC)w= 8 m/s V_A=w_OAxr_A/O =>Angular Velocity of OA: w_OA=80k rad/s V_B=w_BCxr_B/C =>Angular Velocity of BC: w_BC=-40k rad/s (wrong direction?) =>Angular Velocity of DC: w_DC=w_BC=-40k rad/s Then I'm stuck. I think I could use a_A=(alpha)xr+wx(wxr) but I don't know how to find a_A Any help would be greatly appreciated.

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