A ball is fastened to one en of a 28 cm string, and the other end is held fixed to a support. The ball whirls in a horizontal circle. Find the speed of the ball in its circular path if the string makes an angle of 35 degrees to the vertical.

Answer 1

A free body diagram of forces acting on the ball should tell you that
Tan 35 = (mg)/(mv^2/R)
= R g/ v^2
The mass m cancels out.
Solve for v.