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physgrl

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## Homework Statement

9. A 0.61 kg mass attached to the end of a 0.50 m cord rotates in a vertical circle. The angular speed of the mass at the bottom of the circle is 2π rad/s. The tension in the string at this point is:

a. 18 N

b. 21 N

c. 12 N

*d. 54 N

## Homework Equations

W=mg

F=ma

a

_{centripetal}=v

^{2}/r

v=ωr

## The Attempt at a Solution

I used F

_{tension}=F

_{centripetal}+W and I got 18N the answer key says its 54N