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I am new on here so I hope you quality people can help me out:)

I have this question and it asks me to solve it using Virtual Work? What is that and how do I apply it to this question:

"A slender rod of length L is attached to a collar at B and rests on a portion of a circular cylinder of radius r. P and Q are two applied point loads. The effect of friction is neglected. For given L, r, P and Q, determine the value of θ corresponding to the equilibrium position of the mechanism by using the method of virtual work."

HERE IS THE ASSOCIATED DIAGRAM:

http://img504.imageshack.us/img504/5771/dsc01399gi8.jpg [Broken]

After some research I have found the question stems from a book called: Vector Mechanics for Engineers, which I do not own!

Thanks for your time and any help is appreciated :)

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# Homework Help: What is virtual work? And how does it apply to this question?

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