Physics

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How do you solve this problem?
A ball on the end of a string is revolved at a uniform rate in a vertical circle radius of 72.0 cm, as shown in figure. If its speed is 4.00m/s and its mass is .300 kg. Calculate the tension in the string when the ball is a) at the top of the path, and b). when it's at the bottom?

  • Physics -

    a) Mg + T = MV^2/R
    T = M(V^2/R -g)

    b) T - Mg = MV^2/R
    T = M(V^2/R + g)

    T is the tension that you want to compute.
    Make sure R is in meters when you do the calculation. The force will be in Newtons.

  • Physics -

    Can you like work the problem out so i can see how it is done?

  • Physics -

    what is the V in this case? That's what throwing me off..

  • Physics -

    V is velocity, given as 4m/s

  • Physics -

    Okay, I worked them out, but I am not getting the answer they should be. Like a) i am getting as what should be the answer as b. So, i don't if someone could work them out or tell me maybe what doing wrong. Thanks!

  • Physics -

    If the answers to a and b answers are interchanged, your book may be wrong.

    All you have to do is use the formulas provided, using these variables:
    V = 4.0 m/s
    M = 0.3 kg
    g = 9.8 m/s^2
    R = 0.72 m

  • Physics -

    Okay, so for a) get 3.13 and b). get 16.5?

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