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Elevator problem (mass and acceleration)

  1. Oct 7, 2012 #1
    1. The problem statement, all variables and given/known data

    A man stands on a scale in an elevator that is accelerating upward. The scale reads 864.3 N. When he picks up a 36.0 kg box, the scale reads 1234.8 N. What is the man's mass?

    What is the acceleration of the elevator?


    2. Relevant equations

    F=ma

    3. The attempt at a solution
    I'm confused because of the box. Acceleration must have something to do with:
    864.3 +36.0(9.8)= 1217.1N
    But because of the acceleration, it is 1234.8N.
    I'm not sure how to proceed...
     
  2. jcsd
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