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Elevator Weight and Acceleration

  1. Jun 4, 2007 #1
    1. The problem statement, all variables and given/known data
    Luke stands on a scale in an elevator which has a constant acceleration upward. The scale reads 0.968 kN. When Luke picks up a box of mass 18.6 kg, the scale reads 1.215 kN. (The acceleration remains the same.) Calculate the acceleration of the elevator (enter first). Is it up or down?

    my answer: 3.48 m/s^2 up

    Calculate Luke's weight.
    2. Relevant equations
    I cant get luke's weight, i know i use F=MA, but when i plugged in the knowns i got Kg, and it wants N.
    Last edited: Jun 4, 2007
  2. jcsd
  3. Jun 4, 2007 #2
    It's because the question is asking for his weight not his mass. If you can work out his "mass", your can work out his weight.
  4. Jun 4, 2007 #3
    Ok, i did (968N/3.48) x (9.8)= 2725.97N yet it says im wrong, any ideas?
  5. Jun 5, 2007 #4
    The 968N comes from a combination of gravitational acceleration and the acceleration of the elevator.
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