Ben Mullins Posted October 10, 2009 Share Posted October 10, 2009 OR MASSIVE! Whats on t'other side of the black hole? Nobody knows . . . (Im happy to be proved wrong!) Quote Link to comment Share on other sites More sharing options...
Phil Claridge Posted October 10, 2009 Share Posted October 10, 2009 some of my models make a black hole and dont fly again Quote Link to comment Share on other sites More sharing options...
andy watson Posted October 10, 2009 Share Posted October 10, 2009 Peters post (partially) reminds me of an English inventor in the 17th century- I can't remember his name- who was working on powered flight. He basically gave up in disgust claiming that powered flight was imposible until mankind was capable of getting the power of 100 horses in a beer mug. It turned out he was almost exactly correct in everything he was doing- it was just the power wasn't available to him- exactly as he said! Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 11, 2009 Share Posted October 11, 2009 I had a serious book on aviation printed in the late 30s. Some professor stated that it was physically impossible for an aircraft to exceed the speed of sound. Probably the same one who proved that bumble bees cannot fly Quote Link to comment Share on other sites More sharing options...
TonyS Posted October 11, 2009 Share Posted October 11, 2009 My first wife had an O Level....and she was blonde...so anything's possible. Quote Link to comment Share on other sites More sharing options...
Former Member Posted October 11, 2009 Share Posted October 11, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
John Cole Posted October 11, 2009 Share Posted October 11, 2009 Ben: yes, fusion happens on earth - in a hydrogen bomb. It also happens in a small way in certain experiments but it's a dead loss as a power source, as the power needed to run the experiment is much greater than the fusion power created. What other element will they use? Don't know! But what they'll be looking for is I guess one that's either easy to make or is a by-product of a nuclear reactor. Plus (probably) multi-year half-life, and preferably a light-ish element (more electrons emitted per kilo than a heavy one). Finally, it may be important what the isotope decays into, for e.g. the physical stability of the cell. S-35 decays into Chlorine-35, which is radiologically stable.Edited By John Cole on 11/10/2009 09:44:06 Quote Link to comment Share on other sites More sharing options...
John Cole Posted October 11, 2009 Share Posted October 11, 2009 PhilW: scientists DON'T say nothing can travel faster than light. They say things can't travel faster than the universal propagation speed (or constant). Light goes as fast as it can, and in a vacuum that's at the UPS. So what's the point I'm making? It's that light goes slower when it's not in a vacuum. Its speed is slowed in proportion to the refractive index. So in water, light travels at about 75% of its speed in a vacuum. Remember the pictures of radioactive bits submerged in water, surrounded by a blue glow? That blue glow is called Cherenkov radiation and is given off when particles (in this case mainly beta particles, see above) shoot through the water FASTER than the (local, in water) speed of light. Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted October 11, 2009 Share Posted October 11, 2009 What would we do without you John, the Oscar's yours Quote Link to comment Share on other sites More sharing options...
Garry Pollard Posted October 11, 2009 Author Share Posted October 11, 2009 Blimey this post has gone better than I expected, however it has proved one thing to me and that is how many clever members we have on this forum, no wonder we get a good answer to virtually every question asked Long may it continue Garry Quote Link to comment Share on other sites More sharing options...
Former Member Posted October 11, 2009 Share Posted October 11, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 12, 2009 Share Posted October 12, 2009 Don't try buying the Light Slower Downer on ebay, it has escaped and is slowing everything down there, I think it ihas been named Ps or Postal Strike. Quote Link to comment Share on other sites More sharing options...
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