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Homework Help: Torque problem

  1. Dec 21, 2008 #1
    1. The problem statement, all variables and given/known data
    A 4.74 kg spherical ball with radius 1.4 cm rolls on a track with a loop of radius 39 cm that sits on a table 1.2 meters above the ground. The last 1 meter section of the track is horzontal and is not connected to the rest of the track. 0.33 meters of this section of the track hangs over the edge of the table. The track has a linear mass density of 0.82 kg/m.
    How far does the ball travel along the loose length of track before the track starts to tip?

    2. Relevant equations

    3. The attempt at a solution
    can you please check my work thanks
    Torqueball = Torquetrack
    4.75(g)x = 0.82g(0.5)
    x = .82/.4.75 (0.5) = 0.086498
    it travels 0.33m - 0.089498 =0.24m
  2. jcsd
  3. Dec 22, 2008 #2


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    Science Advisor
    Homework Helper

    Hi myoplex11! :smile:

    Nooo …

    which point have you taken moments (torque) about? :confused:

    take moments about the edge of the table

    try again! :smile:
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