Physics problem?

Question

A ball on the end of a string is cleverly revolved at a uniform rate in a vertical circle of radius 85.0 cm. If its speed is 3.25 m/s and its mass is .335 kg, calculate the tension in the string when the ball

is at the top of it's path

and at the bottom of the path?

i think i got the right anwser but not completely sure plz help!

Answer 1

Consider a FBD at the top of the path
T+m*g-m*v^2/r=0

and at the bottom of the path
T-m*g-m*v^2/r=0

Here are the numbers

at the top
T=0.877 N

at the bottom

T=7.45 N

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