Instantanious center of rotation problems

[Devtycoon]

Homework Statement

[PLAIN]http://i61.tinypic.com/10dwmtv.
what is the instantaneous center of rotation for the rigid body.

OA = 16
AB = 25
AD = 60
BC = 35
ω_OA=2s^-1

Homework Equations

V_b=ω_CB*BC

The Attempt at a Solution

I am assuming the values angles and vectors from red because I think the problem is impossible to solve without assuming AB is the top side of a parallelogram. I determined the velocity of A by the same relevant equation. If my assumption is correct Vb and Vd move in the same velocity and direction. since they are parallel and in the same direction the center of rotation at this instant is infinite and therefore AD has translational motion. BC is not translational but piston C is translational. It seems the instantaneous center of rotation for member BC is at point C when i draw perpendicular lines to the vectors Vb and Vc. Any ideas

 

[Greg Bernhardt]

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