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Mass suspended from a string - with tangential motion

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Hi. Can you please show me how to do the following problem? It has me completely confused.

"A mass m = 9.100 kg is suspended from a string of length L = 1.510 m. It revolves in a horizontal circle as shown. The tangential speed of the mass is 2.850 m/s. What is the angle theta between the string and the vertical (in degrees)? Do not enter units." (Please see attached Word file for drawing.)

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The expert examines a mass suspending from a string with tangential motion.

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Please see the attached document for a formatted version.
<br>From the figure, we can write, q = L/R = 1.51/R
<br>The centripetal force keeping the ball in a circular path is given by
<br>Fc = ...

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