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comment relationship between voltage and current
If you hold power FLAT and increase current, voltage would have to decrease. Similarly, if you hold resistance flat and increase current, voltage would have to increase. In practical terms, to hold power flat while you decrease voltage, you would have to be adjusting resistance down to increase current.
answered Rate of change in size:Moving Objects
comment What would it be like “inside” a star?
@DevSolar - Generally, radiation falling on an object changes inversely to the square of the change in distance. Move something twice as far away, the radiation drops to 1/4. Move something half as far away, the radiation increases by 4. Move something to 1/500 the distance, the radiation increases by 500^2 = 250,000 times. Note that the actual temperature doesn't scale linearly... the hotter something gets, the faster it radiates heat away. FYI, Mercury is .387 AU from the sun (Earth is 1 AU), so each square meter on Mercury receives 1/(.387^2) = 6.7 times as much radiation as Earth.
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comment How would we see a near-lightspeed object emitting light?
Would this affect other forces besides electromagnetism? Would an object traveling near light speed relative to me exert weakened nuclear, or even gravitational force on me as it passed?
comment Why does the universe follow the uncertainty principle?
I've seen an argument that the presences of the uncertainty principle allows the elimination of some possible paradoxes and contradictions (of the Zeno's Arrow type).
comment Why does a helium filled ballon move forward in a car when the car is accelerating?
Maybe an easier way to envision the forces involved would be to use a bottle filled with water except for one air bubble. Then, it makes intuitive sense that the bubble moves in opposition to the acceleration.
comment Why doesn't light kill me?
Wow, this question got protected fast. Guess I'll just add a comment... Another perspective is to look at dilution. At the surface of the sun, of course, the light intensity would vaporize you instantly. But if you do some geometry, you can see that as the spherical shell of light expands, by the time it's reached the earth it's covering an area close to 50,000 times larger... reducing the intensity at any point by 50,000 times.
comment Why does space expansion not expand matter?
What about two objects connected with a spring? It sounds like the 'outward' movement would be accelerated by the expansion factor, while the inward movement would be retarded by the same amount. Not disagreeing that it's impractical, but still interesting that it's even possible in theory.
comment Are quantum mechanics and determinism actually irreconcilable?
Some people see the many-worlds interpretation of quantum mechanics as preserving determinism, since there is no random waveform collapse as such in that theory; instead, the only 'random' factor is our subjective perception of which universe we are in (which isn't really random, since all other universes can ask the same question).
comment Membrane that allows liquid to pass only when forced under pressure
I'm imagining a rubber membrane, with moderate thickness and many small puncture holes punched in it. The holes would be small enough to block flow, until pressure increase and the whole membrane swells and thins. Never seen anything like that, though.
comment Rotation, cats landing on their feet, and conservation of angular momentum
It would. The 90 degree arc when it's fully extended contributes far more angular momentum than the 90 degree arc backwards does when it's near your center of gravity.
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