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Posted by on Wednesday, March 21, 2012 at 9:21pm.

A 80- kg child sits in a swing suspended with 2.6- m-long ropes. The swing is held aside so that the ropes make an angle of 46 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go.

  • PHYSICS PLEASE HELP - , Wednesday, March 21, 2012 at 9:28pm

    (M/2)Vmax^2 = M g L(1 - cos46)

    L(1- cos 46) is the maximum rise of the swing above the bottom position, where the velocity is Vmax

    Vmax = sqrt[2 g L (1-cos46)]

  • PHYSICS PLEASE HELP - , Wednesday, March 21, 2012 at 9:38pm

    does 1-cos46 represent L or is L part of that equation?

  • PHYSICS PLEASE HELP - , Wednesday, March 21, 2012 at 11:15pm

    L is the rope length, and is part of the equation. I already told you what
    L*(1- cos 46) is .

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