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Homework Help: Moving Van

  1. Sep 28, 2004 #1
    Ok, here's a problem that stumps me. I'm not quite sure how to go about doing it...especially since there's an angle involved. I tried doing it before, but I forget what I tried...either way, the answer was wrong. Any advice would be appreciated. Thanks! :eek:)

    ----A mass M = 13.0 kg is suspended by a massless string from the ceiling of a van which is moving with constant acceleration a. If the string makes an angle theta = 11o with respect to the vertical, what is the acceleration a of the van?-------
     
  2. jcsd
  3. Sep 28, 2004 #2

    Pyrrhus

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    Use Newton's 2nd Law

    [tex] \sum^{n}_{i=1} \vec{F}_{i} = m \vec{a} [/tex]

    Do a Free Body Diagram, so you can get the acceleration of the Body hanging, which will be ????
     
  4. Sep 28, 2004 #3
    hmm...but how do i incorporate the angle?
     
  5. Sep 28, 2004 #4

    Pyrrhus

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    Components of Tension.
     
  6. Sep 29, 2004 #5
    By "Components of Tension", he means that the x & y components can be solved using trigonomotry.

    To find the X component, it would be: Tension * Cos11
    Y component: Tension * Sin11

    Remember that there is also always a Y component of mg doing straight down.

    Dave
     
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