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Homework Help: UCM problem

  1. Oct 13, 2008 #1
    1. The problem statement, all variables and given/known data

    A 1.2 m long pendulum reaches a speed of 4.0 m/s at the bottom of its swing.
    http://members.shaw.ca/barry-barclay/Self-Tests/test07/q02.gif
    What is the tension in the string at this position?

    2. Relevant equations

    Fnet=Mv^2/r

    3. The attempt at a solution

    Im my FBD I had FT acting up, and fg acting down.

    Ft-Fg=mv^2/r
    Ft-mg=mv^2/r
    Ft -(9.8)(3)=(3)(4.0)^2/(1.2)
    Ft=40 +(9.8)(3.0)

    EDIT Realized my mistake less than a second after posting this. :) Mods can delete.
     
  2. jcsd
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