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September 19, 2014

Homework Help: physics

Posted by Adam on Wednesday, May 23, 2012 at 11:45am.

A 0.700-kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0 with respect to the vertical as shown. What is the tangential speed of the ball?

I got this:counterbalanced by the horizontal component of rope tension:
m*g*sin(70)

r=2.2*sin(70)
So here's the result
using g=9.81
v=sin(70)*sqrt(2.2*9.81)
v=4.36 m/s but its wrong could someone please help me out. Thank you and sorry for reposting.

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