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newtboy
(Member Profile)
siftbotCongratulations! Your video, Spinning A Top In A Vacuum Chamber, has reached the #1 spot in the current Top 15 New Videos listing. This is a very difficult thing to accomplish but you managed to pull it off. For your contribution you have been awarded 2 Power Points.
This achievement has earned you your "Golden One" Level 17 Badge!
Spinning A Top In A Vacuum Chamber
MilkmanDan says...That space video from @oohlalasassoon tends to proves you right -- there there is no friction on the pivot point, but the top is still surrounded by air. It isn't clear exactly how long it would take before the air resistance would stop the spin, but it seems like it would be quite a bit longer (orders? of magnitude) even than the top in a vacuum.
I wouldn't have called it that way; the pivot point is so small that it has an very small surface area. And the vacuum chamber would leave that variable close to constant, but still resulted in a lot longer spin time -- so the air resistance (friction with the air instead of friction with the pivot point) clearly does have an effect.
Interesting stuff!
Neat. Makes me wonder how long it would spin in the other extreme, surrounded by air but with zero friction. In my naive mind, I imagine it'd go considerably longer. And of course with zero air and zero friction it'd go on indefinitely.
Air resistance vs. friction. Who will win out?!
newtboy
(Member Profile)
siftbotYour video, Spinning A Top In A Vacuum Chamber, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.
This achievement has earned you your "Pop Star" Level 28 Badge!
Webb Backplane Pathfinder Arrives at JSC for Cryotesting
oritteropoIt might help to start with what the Backplane Pathfinder actually is - it's a non-flight replica of the Webb telescope’s center backplane (that link has more info and pictures).
Chamber A allows simulating the cold environment the real telescope will face in space, and is the same vacuum chamber where Apollo spacecraft were tested.
Now, to answer your question: They are testing the test procedures for the real telescope! (source: NASA). I realise that doesn't exactly answer your question, but I haven't found details of the actual tests they plan to run... so as a distraction, here are some more images - http://jwst.nasa.gov/images_backplane.html
Test it for what?
billpayer
(Member Profile)
siftbotCongratulations! Your video, Bowling Ball and Feather dropped in largest vacuum chamber, has reached the #1 spot in the current Top 15 New Videos listing. This is a very difficult thing to accomplish but you managed to pull it off. For your contribution you have been awarded 2 Power Points.
This achievement has earned you your "Golden One" Level 3 Badge!
billpayer
(Member Profile)
siftbotYour video, Bowling Ball and Feather dropped in largest vacuum chamber, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.
19-year-old hopes to revolutionize nuclear power
bcglorf says...What Taylor built though was a fusor though, not a breeder reactor. A fusor is basically a vacuum chamber with a high voltage wire run into the center and a place to puff in a bunch of fuel gas. With a fusor you get a short term burst of radiation, but nothing before or after is contaminated. With a breeder reactor you start with a bunch of dirty material and make more even dirtier material.
he's copycatting the "Radioactive Boyscout" who built a reactor in his backyard in 1995
http://harpers.org/archive/1998/11/the-radioactive-boy-scout/
it leaked radiation and he was picked up and his back yard was dug up, garage and all, and put into barrells and taken to nuclear waste area. The EPA were all in "space suits" in his yard, and he had tricked the nuclear regulatory agency and several places into providing him with info by faking his age and making fake letterheads.
the wild thing is the boy scout actually made a breeder reactor, but it was leaking a lot of radiation the EPA was registering radioactive material all over the yard and into neighbor yards.
Plasma Propulsion Testing
Constitutional_PatriotYou'll notice that the engine was being tested in a vacuum chamber to simulate a void like outer space.
In layman's terms: this is like a weak version of the USS Enterprise's impulse engines.
See http://www.videosift.com/video/NSTAR-Ion-Plasma-Propulsion-1st-generation for more info when an earlier version that was used on a satellite.
I'm surprised there's no votes at ~50 views.. this has been talked about every so often on NPR since 2004.