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Calculating pressure in a barometer

  1. Dec 23, 2012 #1
    A gas is contained in a vertical frictionless piston-cylinder device. The piston has a mass of 4 kg and cross sectional area of 35 cm2. A compressed spring above the piston exerts a force of 60N on the piston. If the atmospheric pressure is 95 kPa, determine the pressure inside the cylinder.

    how do you solve this question
  2. jcsd
  3. Dec 23, 2012 #2
    assuming pressure to be uniformily applied, you can just divide total force (4*9.81 + 60 + 95*1000* 35*0.0001) by piston area (35*0.0001). you will answer in pascal.
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