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Homework Help: Pressure Ratio Problem

  1. Jan 31, 2010 #1
    1. The problem statement, all variables and given/known data
    If the cross-section of the barrel of a pump is 5 square centimeters, the stroke of the piston is 20 centimeters, and the volume of the receiver, in which the air is drawn from, is 1 liter, calculate the ratio of the pressure of the air in the receiver to the original pressure after three strokes of the pump.

    2. Relevant equations

    3. The attempt at a solution
    Force=m*a = (1 liter)(9.81) = 9.81
    Area = (5)(20)=100
    p=f/a = 9.81/100=.0981

    Is this correct so far? how do calculate the ratio?
  2. jcsd
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