# Error caused by pulley eccentricity [closed]

Not sure if this is perfectly a physics question:

A rope is wrapped around a cylinder of diameter D. The cylinder is slightly eccentric so that the distance between the axis of the cylinder and the axis of rotation is e. As the cylinder rotates, it pulls the rope. At t=0, the far end of the rope is at position 0.

What is the function of the rope position with respect to the angle of rotation of the cylinder? (This is not a homework question BTW)

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## closed as too localized by David Z♦Nov 15 '11 at 21:01

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This is Math! Epicycles et. al. – Georg Nov 15 '11 at 13:29
I thought physics was just math ? – Rocketmagnet Nov 15 '11 at 13:56
I just saw that You are a Senior "Robotics Design Engineer" This is basic engineering stuff! – Georg Nov 15 '11 at 14:07
I know. It's embarrassing. I have calculated an answer, I just can't believe my answer. – Rocketmagnet Nov 15 '11 at 14:13
This sounds exactly like a homework question, and in any case this is a site about concepts, not a site where you post problems for other people to do. Please edit the question to include the specific concept you're confused about. You could show what you've done, explain why it doesn't make sense, and ask about whether it's accurate. With those edits I would be very happy to reopen the question. – David Z Nov 15 '11 at 21:00