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please help with this problem...i have No clue how do it

Two pith balls of mass m are suspended by silk strings of length L. When they are charged they repel each other at an angle of 2 theta, since like charges repel. Using Coulomb's Law and Newton's Law, derive the following http://img.photobucket.com/albums/v199/prncess20/physics.jpg" [Broken] where k is the coulomb constant. The expression will be used to calculate the charge q on each ball.

Two pith balls of mass m are suspended by silk strings of length L. When they are charged they repel each other at an angle of 2 theta, since like charges repel. Using Coulomb's Law and Newton's Law, derive the following http://img.photobucket.com/albums/v199/prncess20/physics.jpg" [Broken] where k is the coulomb constant. The expression will be used to calculate the charge q on each ball.

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