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1) What is the tension in the upper wire?

2) What is the tension in the lower wire?

okay i know that m=.4 and v=8.3

i dont know r, which i thought that maybe i could find by doing the square root (1^2-.5^2) =.866

and then Force= m V^2 / R sooo.. (.4)(8.3^2)/(.866) = 31.819 . but i dont know where to go from there?