What is the solution to this waves/statics problem?

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Matt1234

Homework Statement

[PLAIN]http://img5.imageshack.us/img5/7653/73215327.jpg

The answer in the text is sqrt(15)Mg I am not sure how to obtain this from. Please advise.

Last edited by a moderator: May 5, 2017

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Matt1234

if this is not clear i can post more.