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Rope Tension with newtons laws

  1. Nov 14, 2009 #1
    1. The problem statement, all variables and given/known data

    How much tension must a rope withstand if it is used to accelerate a 1000 kg car vertically upward at 0.80 m/s2? Ignore Friction.

    2. Relevant equations

    fay= ma ?
    mg-fn=0

    3. The attempt at a solution

    F=MA
    F=1000kg * .8
    F= 800 WRONG!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 14, 2009 #2
    It says you're pulling against gravity as the car moves upwards. Means you have to have at least 9800 N just to hold the thing steady. 800 would be right if it was moving vertically.
     
  4. Nov 14, 2009 #3
    so the question is asking how much tension the rope must endure to accelerate 1000kg at .8m/s/s. So would that mean 9800+800?
     
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