Wikia

Welcome to PhysWiki.
We are currently editing over 85 articles, and you can help

PhysWiki

The purpose of this wiki is to provide physics graduate students and other scientists with peer-reviewed solutions to the types of problems that can be found on PhD qualifying exams. The articles consist of graduate-level problems from public problem banks. Public problem banks are often compiled by various university physics departments and include questions that they have given on previous PhD qualifying/prelim exams. The community can submit problems, search for problems, and post or correct solutions to these problems.

To write a new PhysWiki

University Problem Banks

University of Virginia

Current events

Add facts, tips, or events here.

Featured Problem

Rotating tube 12/27/2009 with solution (ws)

A particle of mass m is placed in a smooth uniform tube of mass M and length l. The tube is free to rotate about its center in a vertical plane. The system is started from rest with the tube horizontal and the particle a distance $r_0$ from the center of the tube.

For what length of the tube will the particle leave the tube when $\dot{\theta}=\omega$ is a maximum and $\theta=\theta_m$ ? Your answer should be in terms of $\omega$ and $\theta_m$ .