- #1
rbwang1225
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Homework Statement
A man plays a Yo-Yo ball as shown in the figure. The mass of the ball is m, and the length of the string is L. The ball moves in a circle along a vertical plane. What is the difference of the string tension at the lowest point ([itex](T_{2})[/itex]) and the highest point ([itex](T_{1})[/itex])
The Attempt at a Solution
([itex]\frac{mv^{2}}r=T_1+mg=T_2-mg[/itex])
[itex]\Rightarrow T_2-T_1=2mg[/itex]
But the answer is 6mg, I guess the problem is that v is not equal at the two different positions. In this case, I don't know how to solve it.