Spunker 8

The table shown weighs 30 lb and has a diameter of 4 ft. It is supported by three legs equally spaced around the edge. A vertical load P of magnitude 100 lb is applied to the top of the table at "D". Determine the maximum value of "a" if the table is not to tip over.

Here is the diagram provided:

http://img10.imageshack.us/img10/6098/staticsi.jpg

Any help is appreciated, Ive been trying to work on this one for hours and haven't got an answer.

For some reason it cut off the end of it. Heres what i have so far:

Δy=Vi(sinθ)(Δx/Vi(cosθ))+.5(-9.81)(Δx/Vi(cosθ))^2

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