Phun Physics... - Page 4

Desmo · 03-10-2008, 07:32

That refers to the size of the round....it's over half an inch in diameter

Now whilst that doesn't always equate to a powerful round, it clearly is in this case

Pickers · 06-10-2008, 17:36

Quote:

Originally Posted by Desmo

That refers to the size of the round....it's over half an inch in diameter

Now whilst that doesn't always equate to a powerful round, it clearly is in this case

In terms of conservation of momentum, with a large mass for the ballistic the recoil is gonna be quite sizable; even if the muzzle velocity is equal to or less than that of a smaller bullet.

Pickers · 30-07-2010, 20:20

What Happens Next?

A balloon is fully inflated and attached to a valve. A semi inflated balloon is attached to the other end of the valve.

The valve is opened; what happens to the balloons?!

http://www.youtube.com/watch?v=7HO7JOrN4t4

Desmo · 30-07-2010, 20:24

Without watching the video, I'd expect them to equalise in volume but I'm guessing I'm wrong

Lozza · 30-07-2010, 20:49

Quote:

Originally Posted by Pickers

What Happens Next?

A balloon is fully inflated and attached to a valve. A semi inflated balloon is attached to the other end of the valve.

The valve is opened; what happens to the balloons?!

http://www.youtube.com/watch?v=7HO7JOrN4t4

I'd have said what Desmo said...

you need to talk though pickers!

Mark · 30-07-2010, 21:34

I sense shenanigans!

I'd suggest talking too, but I'm a worse offender!

divine · 30-07-2010, 21:37

I'd guess it's something to do with why the first part of blowing up a balloon is the hardest bit, less strength/tension/whatever in the material so it gives far easier than the material on the less inflated one.

Lozza · 30-07-2010, 21:37

Quote:

Originally Posted by Mark

I sense shenanigans!

Those balloons don't look much like balloons

Mark · 30-07-2010, 21:44

Quote:

Originally Posted by divine

I'd guess it's something to do with why the first part of blowing up a balloon is the hardest bit, less strength/tension/whatever in the material so it gives far easier than the material on the less inflated one.

True - if the first balloon had previously been inflated, and the second one hadn't, that would help a lot.

Belmit · 30-07-2010, 22:25

Whilst I haven't done Physics since A-level, my first thought was that if both balloons were identical shapes and thicknesses that the pressure would equalise and both balloons would stay at the same size with an equal amount of air in them. Thinking about it though, when you blow a balloon up it takes a huge amount of effort to start it, then gradually less and less after a certain point. When the air is released it comes out slowly at first then the last bit shoots out very quickly indeed. This suggests that up to a point the pressure is incredibly high in the small balloon, certainly greater then in the larger one. Hence the result.

03-10-2008, 07:32	#31
Desmo The Last Airbender Join Date: Jun 2006 Location: Pigmopad Posts: 11,915	That refers to the size of the round....it's over half an inch in diameter Now whilst that doesn't always equate to a powerful round, it clearly is in this case __________________

30-07-2010, 20:20	#33
Pickers Absinthe Join Date: Jul 2006 Location: Cornwall Posts: 2,692	What Happens Next? A balloon is fully inflated and attached to a valve. A semi inflated balloon is attached to the other end of the valve. The valve is opened; what happens to the balloons?! http://www.youtube.com/watch?v=7HO7JOrN4t4 __________________ Pictures

30-07-2010, 20:24	#34
Desmo The Last Airbender Join Date: Jun 2006 Location: Pigmopad Posts: 11,915	Without watching the video, I'd expect them to equalise in volume but I'm guessing I'm wrong __________________

30-07-2010, 21:37	#37
divine Moonshine Join Date: Sep 2007 Location: Southampton Posts: 3,201	I'd guess it's something to do with why the first part of blowing up a balloon is the hardest bit, less strength/tension/whatever in the material so it gives far easier than the material on the less inflated one. __________________

30-07-2010, 22:25	#40
Belmit The Mouse King of Denmark Join Date: Jul 2006 Location: The Winchester Posts: 6,476	Whilst I haven't done Physics since A-level, my first thought was that if both balloons were identical shapes and thicknesses that the pressure would equalise and both balloons would stay at the same size with an equal amount of air in them. Thinking about it though, when you blow a balloon up it takes a huge amount of effort to start it, then gradually less and less after a certain point. When the air is released it comes out slowly at first then the last bit shoots out very quickly indeed. This suggests that up to a point the pressure is incredibly high in the small balloon, certainly greater then in the larger one. Hence the result. __________________

30-07-2010, 21:34	#36
Mark Screaming Orgasm Join Date: Jul 2006 Location: Newbury Posts: 15,194	I sense shenanigans! I'd suggest talking too, but I'm a worse offender!