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Pressure problem

  1. Jan 15, 2016 #1
    1. The problem statement, all variables and given/known data
    A car is put into a garage higher by a hydraulic lift. How large should be the surface on which the vehicle rest if you to lift a vehicle of 1000kg higher with overpressure of 1 atm?


    2. Relevant equations

    Pabsolue pressure = P atmos + P relative
    P=F/A
    F=m xa


    3. The attempt at a solution
    P absolute = 101325 Pa +101325 pa
    1000kg x9.81 m/s^2 / (A) = 202650
    1000kg x 9.81 =202650A
    A= 1000x9.81 /202650
    A=0.04840 m^2

    But the answer should be 9,682.10-2 m 2
     
  2. jcsd
  3. Jan 15, 2016 #2
    It's always a hint when your answer is off by very close to a factor of two.
     
  4. Jan 15, 2016 #3
    I don't understand
     
  5. Jan 15, 2016 #4
    What would be the net force produced using a closed cylinder containing air at atmospheric pressure?
     
  6. Jan 15, 2016 #5

    haruspex

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    Is there a vacuum above the car and the platform it stands on?
     
  7. Jan 17, 2016 #6
    No there is no vacuum
     
  8. Jan 17, 2016 #7

    haruspex

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    Right. So what force have you overlooked?
     
  9. Jan 17, 2016 #8
    Thank you for helpful videos
     
  10. Jan 17, 2016 #9
    Force of gravity?
     
  11. Jan 17, 2016 #10

    haruspex

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    What force is acting on the platform that would not act on it under a vacuum?
     
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