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Physics

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What is the minimum speed that a 5-kg conical pendulum can achieve if its 1 m string has a maximum tension rating of 520 N?
A. 9.5 m/s
B. 10.2 m/s
C. 4.9 m/s
D. 20.2 m/s
E. 12.3 m/s

My solution's manual says the answer is B, how is it the answer?

  • Physics - ,

    ma=mv²/R =T•cosα
    R= L•cosα
    v=sqrt(T•L•cos²α/m)
    V(max) at cos α =1 =>
    v(max) = sqrt(T•L/m) =
    sqrt(520•1/5) = 10.2 m/s

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