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Homework Help: Am i going right?

  1. Feb 11, 2007 #1
    1. The problem statement, all variables and given/known data
    A child (mass=25kg) moves with a speed of 1.50ms-1 when 7.8m from the centre of a merry-go-round. Calculate
    a) the cetripetal acceleraton of the child
    b) th net horizontal force exerted on the child

    2. Relevant equations
    centripetal acceleration = v2/r

    3. The attempt at a solution

    centripetal acceleration = (150)2(squared)/7.8

    do i work out the horizontal force exerted on the child by using Fc=mv2/r?
    25*(150)2(squared)/7.8 =7.21*10^4 N
  2. jcsd
  3. Feb 11, 2007 #2
    correct. Good job.
  4. Feb 11, 2007 #3
    gee thanx for your time
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