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Dumbell problem (conservation of energy)

  1. Oct 7, 2016 #1
    1. The problem statement, all variables and given/known data

    1f8sk2.png

    A dumbell is leaned vertically on the wall. After it is deviated with some angle θ, dumbell starts sliding.
    Determine the angle between the bar and the horizontal face (floor) when the upper mass starts to fall.

    2. Relevant equations

    E = E'


    3. The attempt at a solution

    2yk0rr8.png

    I don't understand how come there is mgL cos θ??
    I think the potential should be mg L sin θ, right??

    Please help
     
  2. jcsd
  3. Oct 7, 2016 #2

    kuruman

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    Right. Do you know how to finish the problem?
     
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