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 Yearling
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Apr
14
comment Capture the entire light field of a 3D scene and construct a virtual scene
Unless you also have a good light source darpa.mil/program/…
Mar
30
answered H2O Fuel of the Future
Mar
24
comment When thermal IR gets reflected from an object, does it change its wavelength (frequency)
Or if the particle it scatters off has high enough energy the reflected photon is blue shifted! Although philosophically - is it the same photon ?
Mar
24
answered When thermal IR gets reflected from an object, does it change its wavelength (frequency)
Mar
24
revised How does a CCD able to differentiate between different colors?
added 151 characters in body
Mar
24
answered How does a CCD able to differentiate between different colors?
Mar
19
comment A twin-like paradox, with no acceleration and no 3rd reference point. What would happen?
If they both have the same path, their clocks agree, no paradox. If you argue that either could consider that they were stationary and only the other moved then the fact that they felt acceleration prohibits this
Mar
19
comment A twin-like paradox, with no acceleration and no 3rd reference point. What would happen?
you can't change direction to meet again without acceeration
Mar
13
awarded  Yearling
Mar
7
comment Would this be a practical way to convert tidal energy into electrical energy?
It's called a tidal barrage and is the most common tidal power. But it requires a convenient inlet/estuary with a large tidal range, it can get blocked with silt and causes environmental damage with changes in saanity
Mar
4
revised Would this be a practical way to convert tidal energy into electrical energy?
added 191 characters in body
Mar
4
comment Would this be a practical way to convert tidal energy into electrical energy?
I was thinking primarily of a wave power device which only had to move the typical waveheight and not the potentially larger tidal range. Although the cost is going to be high if your platform has to accommodate a 10m tidal range
Mar
4
comment Would this be a practical way to convert tidal energy into electrical energy?
Take a look at the inks in the wave power wiki article
Mar
4
answered Would this be a practical way to convert tidal energy into electrical energy?
Feb
16
comment Charged particle/cosmic ray track on sunglasses
No, you scratched them but only noticed when you placed them at a certain angle to the light
Feb
15
comment Speed of satellite when it falls freely on the surface of the earth
The speed of the satelite gives you the height of the orbit.Then it is simply potential energy. Simple if you can assume gravity is constant, a bit more calculus if you need to consider the change in gravity with height.
Feb
7
comment Seasons of Earths Orbit
Distance from the sun doesn't cause seasons. see physics.stackexchange.com/questions/26785/…
Jan
27
comment Safety of Polonium Isotope source
Or in a form which it couldn't be absorbed, such as plated on an insoluable stainless steel disk. If it stays on the disk you can swallow it and have it come out the other end!
Jan
27
comment How is sun's atmosphere (corona) hotter than the surface itself?
@barrycarter that doesn't explain how heat flows from 6000k surface to several million K corona
Jan
23
revised Why is the speed of light defined as 299792458 m/s?
added 443 characters in body