Instantanious center of rotation problems

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The discussion focuses on determining the instantaneous center of rotation for a rigid body given specific dimensions and angular velocity. The user assumes that AB is the top side of a parallelogram to solve the problem, leading to the conclusion that points Vb and Vd move with the same velocity and direction, indicating an infinite center of rotation for AD. It is noted that while AD exhibits translational motion, BC does not, and point C serves as the instantaneous center of rotation for member BC. The user seeks further clarification or additional information to aid in the solution. Overall, the analysis highlights the complexities involved in identifying the instantaneous center of rotation in rigid body dynamics.
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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
ωOA=2s-1

Homework Equations



Vb=ωCB*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
 
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