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Femme_physics

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## Homework Statement

http://img34.imageshack.us/img34/9415/rock1x.jpg

Shaft's AC movement is regulated by runways A and B. The angular velocity of the shaft is 3 rad/sec, counterclockwise. When angle psi = 40 degrees. Calculate:

A) The velocities of pistons A and B (Va, Vb)

B) The velocity of point C (Vc) - magnitude and direction towards the horizontal axis.

## The Attempt at a Solution

My problem is finding P - the instantaneous axis of rotation. I picked this:

http://img600.imageshack.us/img600/5510/getppppppppppppp.jpg Picking it, I got the correct Va, the correct Vb, and the correct Vc. (I'm still working on the angle of Vc to the horizontal axis - so far it's not correct but maybe I'm doing something obviously wrong.)

And the solution manual picked that:

http://img835.imageshack.us/img835/3412/pppppppppppppp.jpg

Are they both correct?

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