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**I am slipping off my spinning disc--**

**1. Homework Statement**

I am taking a non calculus based physics class and have hit a wall with this one. I have a horizontal spinning disc with an Angular Acceleration of .25 rad/s^2 from rest. The disc has a radius of .05 m. A pebble is placed .025m from the center point of the disc and it has a coeff.of static friction of .15. How long will it take for the pebble to slip off the disc? And how many revolutions will the disc have rotated through that time?

**2. Homework Equations**

Wi=Wf + alpha T. But since I can't get T or W I am stuck. If they had furnished a time or rpms or any other bones I could have gotten it.

**3. The Attempt at a Solution**

I think centripetal acceleration is the key but again with out any W I am stuck.

Help please.