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Old Dec 15th 2008, 12:02 AM   #1
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Join Date: Dec 2008
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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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