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Bsc Physics


20h
comment Speed of light, comparison of two light waves travelling side by side
I suspect the answer involves the relativity of simultaneity and that observations by A and A' will disagree about which beam of light was emitted at which times. This is a variation of the train-and-platform thought experiment.
May
12
comment Gravitational force in a building
It is difficult to work out sensible consequences of nonsensical events. In a universe where you can have mass without gravity current physics doesn't apply. Also earthquakes, asphyxiation, explosions, planetary disintegration etc.
May
12
comment What will happen if a ball of ice with the mass of sun is thrown into the sun?
Some small lifeforms around deep-sea thermal vents might survive? Small consolation though.
May
1
comment Optimal size for a bike tire
I suspect wheels are sized to accommodate the largest size of bumps and potholes (i.e. surface irregularities) they are expected to encounter successfully. Otherwise they'd be as tiny as they can economically be made. Rider comfort is a factor that may be harder to model mathematically but I guess you could plug in some empirical values for tolerable vertical accellerations. If your model has perfectly smooth surfaces it won't determine optimal sizing in the real world.
May
1
comment Is current in superconductors infinite? If they have 0 resistance then I (V/R) should be infinite?
@Joshua: I'm guessing something bad happens to the part of the circuit outside the cryostat (or, more likely, safety features prevent anything at all interesting happening).
Apr
30
answered Electrical conductivity of metals on heating
Apr
30
comment Can someone explain the radioactive decay of that would happen over time to a 1 cubic decimeter block of plutonium?
From Wikipedia you can deduce that after 2.27 days you would have half the amount of PU-247 and an unchanged amount of PU-244. You would have an extra amount of AM-247 approximately equivalent (in mass) to the lost amount of PU-247.
Apr
29
answered Is the acceleration of an object a linear function?
Apr
23
comment Is heat from a stovetop, transfered through convection, radiation or conduction?
The molecules in a stove do move. They jiggle about a lot and this jiggling of stovetop molecules can affect adjacent skin molecules.
Apr
23
revised Could time be considered a force
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Apr
23
revised Could time be considered a force
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Apr
23
revised Could time be considered a force
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Apr
23
answered Could time be considered a force
Apr
23
comment How does electric energy flow in a circuit?
Energy flows through the space between battery and lightbulb. Not along wires. See amasci.com/elect/poynt/poynt.html
Apr
23
answered What is the voltage of an average carpet static shock? Can you make it lethal?
Apr
23
answered A moving brush on a vibrating surface
Apr
20
comment Where is all the Dark Matter? Theoretical Question
"Why does the matter need to be inside our universe?" - largely because of the defined meanings of those two nouns?
Apr
15
revised Does universe calculate?
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Apr
14
comment Why do we use capacitors when batteries can very well store charges?
@mike: since as much flows out as in, you can't call it "stored".
Apr
14
revised Why do we use capacitors when batteries can very well store charges?
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