Forces and Gas questions

1. Mar 3, 2014

Ronaldo95163

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. Mar 3, 2014

SteamKing

Staff Emeritus
Why? Don't you realize that gases can be stored at very high pressure in metal cylinders?

3. Mar 3, 2014

Ronaldo95163

But if the cylinder has a volume of 0.5m^3 how can it inflate an empty balloon to 5m^3???

4. Mar 3, 2014

SteamKing

Staff Emeritus
Is the pressure in the balloon after it is inflated equal to the pressure of the gas in the cylinder?

5. Mar 3, 2014

Ronaldo95163

The question didn't say...only thing that was the same was the temperature

6. Mar 4, 2014

SteamKing

Staff Emeritus
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?

7. Mar 4, 2014

Ronaldo95163

No
The material of the balloon would expand past its elastic limit and it would burst

8. Mar 6, 2014

Ronaldo95163

still not getting it :/

9. Mar 6, 2014

SteamKing

Staff Emeritus
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?

10. Mar 6, 2014

Ronaldo95163

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