12,382 reputation
22483
bio website
location
age 30
visits member for 3 years, 11 months
seen 1 hour ago

We once had a Nuclear Engineering proposal on Area 51, but it failed.

My academic interests are in power plants of all types, shapes, and sizes, and how well they play with each other. My hobbyist interest are kind of all over the place. I like the maker movement, I'm most interested in the sensors and data, the "internet of things" kind of stuff. In physics, I'm probably the most curious about general relativity topics, but I'm all over the place.

request sent to Physics Overflow for account creation, 7/11/2014, 1:32pm


2d
awarded  Good Question
2d
answered How can a 360 Degree Rainbow be formed?
Dec
17
answered Where do planets get energy to revolve around sun?
Dec
15
answered Heat transfer between the bulk of the fluid inside the pipe and the pipe external surface
Dec
14
awarded  Notable Question
Dec
12
awarded  Popular Question
Dec
11
asked Argument for stability of journal bearing via inertial and viscous forces?
Dec
4
comment Evaporation as a Feedback
The feedback in global warming in certainly more specific than this. In that case, evaporating more water causes the system to absorb more heat. Nothing matching this dynamic is present with the kettle. The stove's range does have temperature sensitivity, but resistance tends to increase with higher temperature, making the water's effect a negative feedback as opposed to a positive one with regard to global warming water vapor. This effect is minimal anyway.
Dec
3
comment How big would a Dyson swarm have to be to supply the whole earth's human population with power?
I see your process now. You can multiply 150,000 TW-h by 3600 in order to get Joules. The justification for that is TW-h*(3600s/h), hours cancel, you have TW-s, which is TJ. Then your 2nd step makes sense. But this gives 5.4e+20. So that's your error. You had to have used 1e9 for the Tera prefix, whereas it should be 1e12.
Dec
3
comment Rigid bar on the floor of a rotating space station
Just to make this more concrete, some hypothetical station designs do have partially flat floors. Take like 12 individual modules, string them in a circle, and rotate this. Since the walls of the modules were originally flat, the floor is also flat. But walking to one end is like climbing a hill.
Dec
3
comment How big would a Dyson swarm have to be to supply the whole earth's human population with power?
I don't have any idea how you got to 5.4e17 from the 150,000 TW-h.
Dec
2
comment How big would a Dyson swarm have to be to supply the whole earth's human population with power?
@AndrzejRzeczycki The question still stands with the number of 17 billion, which is given as the number of J used by society per second. You can look this up easily and find that it should be TW and not GW. How did you get that wrong number? I don't know because the work is unclear. Right before that you give 5.4e17 W but W is the same thing as J/s. As such, I can't understand what your values are supposed to mean, so I can't isolate your error any further.
Dec
2
answered Will Quantum Computation fail if spacetime is discrete?
Dec
2
revised How big would a Dyson swarm have to be to supply the whole earth's human population with power?
elaboration
Dec
2
answered How big would a Dyson swarm have to be to supply the whole earth's human population with power?
Dec
1
awarded  Nice Question
Nov
24
comment Why did “tickling the dragons tail” by Louis Slotin not cause an explosion?
I see how you use the Wikipedia text to justify that idea that a human had time to react. But that text is wrong. It suggests that he flipped the top of the core over while it was supercritical, but this just isn't the case. The human reaction time is no where near fast enough, even with a prompt jump in thermal reactors. The fast jump in the demon core is even faster. Even if moderators slowed down the generation time, a human will never be fast enough. At the time that action was taken, the core was either critical or oscillating as far as I can tell.
Nov
8
comment Charge orbiting gravitational body
But in other reference frames magnetic fields come and go, right? These are just static, or move with the charge?
Nov
5
comment Is there only radial motion in the Hydrogen ground state?
Let me stress again, this question is about the presence or absence of any non-radial momentum. This is not the same as asking about angular momentum, and we all agree there is no net angular momentum. We also all agree that there is no non-radial net current. But in the probability distribution function of the momentum vector there could be non-radial components. So is there? Yes or no.
Nov
5
comment Is there only radial motion in the Hydrogen ground state?
I thought I was going to post the momentum space wave function, but turns out it can't be done easily! It was brought up here physics.stackexchange.com/q/63004 Ideally we would clearly see in that function what the values are for the theta and phi momentum components. For the present question, it would easily suffice to prove that that form is/isn't a Dirac delta function. So far no one has even managed that task. So this question is entirely up for grabs.