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Homework Help: Calculating acceleration of a plane weighing 9800N

  1. Oct 15, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the acceleration of a plane weighing 9800N when the forward force is 210000N, the drag force due to air resistance is 500N

    2. Relevant equations


    3. The attempt at a solution

    the mass is 1000kg as 9800/9.8 is 100. The resultant force R must be 210000-500=209500

    So is the acceleration 209500/1000 or 209500/9800? 209599/9800=21.38ms^2 so that makes a lot more logical sense than 209.5ms^2

    But force=massXaccelration not force=weightXacceleration.

    I know its another basic question but please someone help stop my head hurting.
  2. jcsd
  3. Oct 15, 2012 #2
    1 tonne for a plane is kind of light so that's probably why you're getting such a quick acceleration. I mean even if you didn t take the air resistance into account, the output of energy by the engine is waaaay to big for 1000kg -s of mass.

    I think the engine alone would have to weigh alot more than that
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