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Forces and Gas questions

  1. Mar 3, 2014 #1
    The first two are the forces questions with my attempt at them...however I don't have the solutions for them and I wanted to know if what I did was correct.

    wrt to the gas questions i'm referring to part e


    How can a cylinder with only 0.5m^3 fill a balloon to 5m^3

    what I was going to do was use the equation for Boyle's law which is V1P1 = V2P2 and use V2 as difference between the volume in the cylinder and the balloon but seeing that the volume in the cylinder is smaller I started questioning that method... :/
     

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  2. jcsd
  3. Mar 3, 2014 #2

    SteamKing

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    Why? Don't you realize that gases can be stored at very high pressure in metal cylinders?
     
  4. Mar 3, 2014 #3
    But if the cylinder has a volume of 0.5m^3 how can it inflate an empty balloon to 5m^3???
     
  5. Mar 3, 2014 #4

    SteamKing

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    Is the pressure in the balloon after it is inflated equal to the pressure of the gas in the cylinder?
     
  6. Mar 3, 2014 #5
    The question didn't say...only thing that was the same was the temperature
     
  7. Mar 4, 2014 #6

    SteamKing

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    Think. Is it reasonable to assume that a balloon could withstand being at the same pressure as a gas in a metal cylinder? Why wouldn't gases be stored in balloons instead of metal cylinders?
     
  8. Mar 4, 2014 #7
    No
    The material of the balloon would expand past its elastic limit and it would burst
     
  9. Mar 6, 2014 #8
    still not getting it :/
     
  10. Mar 6, 2014 #9

    SteamKing

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    Go back and ponder Boyle's Law some more. What happens to the volume of a gas originally kept at a high pressure if the pressure is reduced?
     
  11. Mar 6, 2014 #10
    The volume increases

    would the work done by the balloon be equal to the work done by the gas in the metal cylinder??

    so

    (VΔP) of balloon = V(P2-P1) of the cylinder
     
    Last edited: Mar 6, 2014
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