a tetherball is on a 21.0 m string which makes an angle of 44.0 degree with the vertical as it moves around the pole in a horizontal plane. If the mass of the ball is 1.30 kg what is the ball's speed?

Question

anonymous · Answer

Equate the vertical component of the centripetal force to the force Fg . We do this because we know there is no movement of the ball in the vertical plane, so all forces must cancel out. Once you find Fc , then use Fc=mv^2/r to solve for v.