home bbs files messages ]

Forums before death by AOL, social media and spammers... "We can't have nice things"

   sci.space.science      Space and planetary science and related      1,217 messages   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]

   Message 22 of 1,217   
   Gareth to John Schoenfeld   
   Re: Rockets   
   12 Jul 03 22:19:10   
   
   XPost: sci.physics, sci.space.tech   
   From: gareth.harris@nobody.nowhere.invalid   
      
   John Schoenfeld wrote:   
      
   > Timo Nieminen  wrote in message news:<   
   ine.LNX.4.50.0307110958020.29738-100000@kolmogorov.physics.uq.edu.au>...   
   >   
   >>On Thu, 10 Jul 2003, George Kinley wrote:   
   >>   
   >>   
   >>>if there is no Atmosphere, where do rockets that go in Space get thrust from   
   >>   
   >>Stand on a skateboard on a smooth flat surface, with a bag of rocks. Throw   
   >>the rocks in one direction, and you'll go in the other direction (except   
   >>for the inconvenient effects of friction - use bigger rocks and you should   
   >>see an effect). The rocket works exactly the same way. Throw mass away in   
   >>one direction, and you go in the other direction. "Conservation of   
   >>momentum" is what it's all about.   
   >   
   >   
   > The direction of the rockets acceleration is irrespective of the   
   > direction of mass explusion. I could build a rocket that expels its   
   > mass upwards and it would still accelerate upwards.   
      
   How? Won't that break conservation of momentum?   
      
   -----------------------------------------------------------------------   
   To reply to me directly:   
      
   Replace the text after the@symbol with: totalise DOT co DOT uk   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]


(c) 1994,  bbs@darkrealms.ca