- #1

Zhalfirin88

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**Spinning mass**

## Homework Statement

1) A mass of 7.10 kg is suspended from a 1.21 m long string. It revolves in a horizontal circle as shown in the figure. The tangential speed of the mass is 2.90 m/s. Calculate the angle between the string and the vertical.

Picture 1) http://psblnx03.bd.psu.edu/res/msu/...Force_Motion_Adv/graphics/prob03_pendulum.gif

## The Attempt at a Solution

For 1) I have the equation down to:

[tex] \frac{gL}{v^2} - \frac{gL}{v^2}cos^2 \theta - cos \theta = 0 [/tex] How would I put this into the quadratic formula? (L = length of string)

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