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physics

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A 0.50 kg ball that is tied to the end of a 1.4 m light cord is revolved in a horizontal plane with the cord making a 30° angle with the vertical. (b) If the ball is revolved so that its speed is 4.0 m/s, what angle does the cord make with the vertical?

  • physics -

    You already said the cord makes a 30 degree angle with the vertical. I don't get it.

    A speed of 4.0 m/s requires a certain angle A such that

    M V^2/(L sin A) = T sin A
    T cos A = M g

    so
    V^2/(L sinA) = g tanA

    Solve for A

    Eliminate T

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