How Do You Calculate Tension in Strings for a Rotating Ball?

[sailsinthesun]

Homework Statement

A 4.05 kg object is attached to a vertical rod by two strings as in Figure P6.11. The object rotates in a horizontal circle at constant speed 6.50 m/s.
http://www.webassign.net/pse/p6-11.gif

(a) Find the tension in the upper string.
(b) Find the tension in the lower string.

I have no idea where to begin. Any thoughts?

 

[kamerling]

This was already discussed in this thread

https://www.physicsforums.com/showthread.php?t=217025"