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Circular Motion Question searching for Centripetal force

  1. Nov 30, 2015 #1
    1. The problem statement, all variables and given/known data
    A 50 g weight is swung in a circle on the end of a 90 cm long string at the speed of 5.9 m/s, what is centripetal force? [1.9 N]

    2. Relevant equations
    Vc = (2πr)\T

    |a| = v^2/r

    Fc = T-Fg (not sure if T is force of tension or period, my teacher,incorrectly,uses it as both)

    3. The attempt at a solution
    Fc = T-Fg

    T=2πr/v = .95845199....

    Fc = T- Fg = -3.946

    -3.9 ≠ 1.9 ∴ incorrect
     
  2. jcsd
  3. Nov 30, 2015 #2

    haruspex

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    What directions are T and Fg in? How do you add and subtract forces that act in different directions?
     
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