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Dec
14
awarded  Teacher
Nov
6
awarded  Notable Question
Oct
27
comment Proton 'Laser' ? could we get a laser-like effect?
ps. for the laser, I was trying to describe it's "mechanical" workings, such as: en.wikipedia.org/wiki/Laser_construction
Oct
27
comment Proton 'Laser' ? could we get a laser-like effect?
Thank you, I think I have my answer, and it's: No - it won't work.
Oct
27
asked Proton 'Laser' ? could we get a laser-like effect?
Sep
14
comment Bending of a pipe filled with sand
I assume from the question, the pipe is horizontal and supported at both ends but not supported in the middle?
Sep
14
comment If water evaporates at below 100 degrees then why not stone?
Hmm, I know its sci-fi, but A.C.Clarke was considering sub-light interstellar travel over eons, and was concerned about sublimation of the surfaces of the spaceship, to the vacuum. Made me think the effect is so tiny to ignore it in normal usage, but not strictly zero.
Sep
9
awarded  Popular Question
Feb
25
comment Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star?
thanks! so, if you could convert a sun-like star with only the last billion years left in it, into a dwarf, somehow, presumably keeping the hydrogen and getting rid of the heavy stuff, you WOULD at least get a huge increase in longevity.
Feb
25
comment How fast is the Earth-Sun distance changing
This is kind of a 'wild' idea, but if we assume liquid water on earth for the last ~3 or 4 billion years, yet the sun's output was weaker 3 billion years ago, does that let us put some kind of bound on how much closer the earth would likely to have been? Or are there too many factors (greenhouse gases, etc) which would obscure the result too much?
Feb
25
comment How accurate are Mayan astronomical “ephemerides”?
Yeah, I don't want to come off like a jerk, but it's far more likely they designed it to work in their time, for their equinoxes. which still takes a lot of knowledge and precision. It just still works. kudos to them for building it right in the first place though...
Feb
25
comment How to Generate a Strong Electromagnetic Field?
I think he's looking for strong field AND low weight -- im guessing the magnets are too heavy...
Feb
25
comment Break speed of light with infinite mass
if you're picking up the mass, then I don't think your idea applies, since the mass you grab would be essentially not moving (compared to your almost-lightspeed ship). picking it up would slow you down, unless you spent even more fuel. BUT, maybe if you could carry infinite fuel, the accellerated mass of the fuel in question might help. Course then the problem is how to start -- if your ship weighs infinite pounds, how do you push it hard enough to move it at all?
Feb
25
accepted Energy to move The Earth to mars' orbit?
Feb
25
answered Energy to move The Earth to mars' orbit?
Feb
17
comment Energy to move The Earth to mars' orbit?
ok a lookup for kj to horsepower shows that 634 kj/s is under 1000 horsepower. so, one Bugati veyron, if running for a billion years and somehow able to push to add to the earth's orbital motion, would do it. I wonder if we have a billion years worth of gasoline?
Feb
17
awarded  Commentator
Feb
17
comment Energy to move The Earth to mars' orbit?
@jinwee. ok. using wikipedia values: <br>G = 6.67x10-11 <br>M sun = 1.9891 x 10^30 <br> m earth = 5.97x10^24 <br> r1 = earth-sun dist = 149598261 km. <br> r2 = mars-sun dist = 227939100 km <br> I got E earth = -3.542 x 10^ 22 and E mars = -1.52 x 10^ 22. so, roughly 2 x 10^ 22 joules? <br> over 1 billions years at 365 / 24 / 3600, I converted that down to 634195 j/sec <br> But what is 634 kj per sec? seems like a small amount to move a PLANET ?
Feb
17
comment Energy to move The Earth to mars' orbit?
@jinwee. ok. using wikipedia values:
Feb
17
asked Energy to move The Earth to mars' orbit?