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Homework Help: What is the equation

  1. Nov 23, 2007 #1
    1. The problem statement, all variables and given/known data
    A sled starts from rest at the top of the frictionless, hemispherical hill. What is the equation to calculate the sleds speed at angle (theta)

    2. Relevant equations

    3. The attempt at a solution

    I need to figure out the equation. I'm given theta and the radius. I thought the equation was Rsin(theta) but that was incorrect
  2. jcsd
  3. Nov 23, 2007 #2
    We're told that the hill is frictionless, so we can use the conservation of mechanical energy to find the sleds speed at some angle theta. After finding the final speed, you'll want to use Newton's Second Law along with the equation for centripetal acceleration to find the sleds speed at some angle theta. Can you show me how you would set up the equation for the conservation of mechanical energy?
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