(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A ball of mass M attached to a string of length L moves in a circle in a vertical plane as shown (picture of circle with a radius drawn L and M as a ball on the circle.) the tension at the top in the string is twice the weight of the ball. At the bottom the ball JUST clears ground Air resistance is negligible. Express your answers in terms of M,L, and g.

a. determine the magnitude and direction of the net force on the ball when it is at the top.

Fn=mg-ma???

b. Determine the initial velocity of the ball at the top.

F=mv^2/r???

c.Determine the time it takes the ball to reach the ground if the string is cut when the ball is at the top of the circle.

d. Just before the string was cut, what was the string tension at the bottom? Assume that the ball has the same velocity at all points around its path.

2. Relevant equations

3. The attempt at a solution

Sorry I didn't show too much work but that is because i truly don't know where to start. PLEASE HELP

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Circular motion I HAVE NO IDEA WHAT I AM DOING

**Physics Forums | Science Articles, Homework Help, Discussion**