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Homework Help: Pistons and pressure question help

  1. Jan 27, 2008 #1
    area of a piston is 0.02

    what is the AVERAGE pressure exerted on 2 equal pistons if the force is 25 N

    P = F/A

    do you just combine the areas.. and divide the combined area by F

    i just did... pressure = F/Area of 1 piston

    and since it said average... they both give the same pressure.. add them up.. divide by two, and end up with the same pressure. Is this wrong?

    I didn't combine the areas
  2. jcsd
  3. Jan 27, 2008 #2
    can you write out the entire, complete question?
  4. Jan 27, 2008 #3
    The force exerted on 2 pistons was 10 N.. lets say
    Area of each piston is 2m

    What was the average pressure on the pistons? The word average confused the heck out of me...

    so I found the pressure on each... added them.. divided by 2... and got the same pressure

    Was I supposed to add the two areas?
  5. Jan 28, 2008 #4
    think about it. what has changed?

    if you were to divide pressure by half then you must also divide F/a by half as well otherwise the equation wont work. if you do that then nothing has changed and your getting no where.

    and just to give you an even bigger hint: force isnt changing either.

    hope this helps
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