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Bsc Physics


7h
comment Can a mouse rotating a wheel violate conservation of angular momentum?
@David: the segmented mouse appears to be having trouble rotating the wheel - probably because the wheel has three feet rather than an axle and bearings. Are you not concerned that Africa has detached from Asia and that global warming has caused the submersion of North America, Scandinavia UK etc?
Jun
29
comment Is electricty matter?
@John: :-) Mondays + things wrong in the intertubes.
Jun
29
comment Is electricty matter?
@John: Antionio may be wrong but we don't store electrons in a capacitor. We store energy in a capacitor. The number of electrons within a capacitor doesn't vary significantly in normal use.
Jun
29
comment Why does a change of direction imply an acceleration?
Your two premises seem false. Can you provide references for them?
Jun
12
comment How do I graph acceleration?
You seem to want to produce a graph as a necessary step for producing "accurate" values of velocity from time and accelleration. The graph seems superfluous and harmful to your aim - wouldn't it be simpler, quicker and more accurate to simply calculate the result using a calculator (or a three-cell spreadsheet)?
Jun
10
answered Why are we not able to visualize Dimensions beyond 3 (or maximum 4 including time)?
Jun
9
comment Is two cars colliding at 25 mph the same as one car colliding into a wall at 50 mph in reference to injuries?
The sort of walls that cars typically collide with in my locale are considerably more cushioning than an oppositely moving vehicle. I've seen several typical brick walls demolished by cars with relatively little damage to the car or occupants.
Jun
1
revised Virtual particles, electrons and quantum foam
Remove extraneous matter, fix spelling and grammar for clarity, Remove shouting (CAPS). Formatting.
Jun
1
comment Virtual particles, electrons and quantum foam
possible duplicate of Virtual photons, what makes them virtual?. See Virtual particles and causation which was also closed as a duplicate.
Jun
1
comment What creates voltage?
Do you really mean "causes electrons in that wire to be produced"? By "produced" do you mean created? I assume not but if so, could you explain the production mechanism? I think that part of the answer would benefit from rewording or clarification. Up to now I had understood that the electric field causes already existing free-electrons to drift and that no additional electrons are produced in the wire.
May
30
awarded  Cleanup
May
30
revised Could atmospheric pressure provide a torque to turn a wheel?
rolled back to a previous revision
May
30
revised Could atmospheric pressure provide a torque to turn a wheel?
added 236 characters in body
May
30
answered Could atmospheric pressure provide a torque to turn a wheel?
May
27
comment What does raising voltage do?
It may be worth noting that $10^{11}$ electrons looks like a lot but there are about $6\times10^{18}$ electrons-worth of charge in 1 coulomb, so those $10^{11}$ electrons ($1.7 \times 10^{-8}$ Coulombs) could only drive a 10mA LED for a microsecond or so. (or something - my arithmetic is pretty sloppy).
May
25
comment Why does time exist?
This answer seems a bit circular to me. How would you define simultaneous?
May
22
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.