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visits member for 3 years, 4 months
seen Sep 22 '13 at 16:25

Apr
6
comment Why does a coin falls faster when it's flipping as well?
You need to specify your experimental setup better. I can think of a few things that could be causing issues such as differences between the location and fall distances of the center of mass of the coin when dropped to make it flip vice dropped to not flip. You could be accidentally be effectively dropping the 'flipping' coin a shorter distance. You could also be having air flow effects caused by a nearby surface as the coin rotates. There are several possible sources of the difference, but they depend on your setup.
Apr
1
comment If you place a spring on a neodymium hard-drive magnet, it appears to vibrate in slow-motion. Why is that so?
Are you using a compact florescent light on your desk? If you are, you may be seeing a 'strobe' effect rather than a large physical change in the frequency. A small change in the oscillation frequency could produce a visual 'beat frequency' effect where it appears to vibrate much slower than the actual change in frequency would suggest.
Mar
29
comment How do levers amplify forces?
Here is a mental model that might help. Think of a series of balls connected in a straight line by very rigid springs floating in space with no external forces acting on it. When it is in its 'rest state' there are no stresses on it. Now give the ball at one end of the assembly a push at right angles from the line. When you do that the spring connecting it to the next ball bends a bit - transmitting the force to the next ball as it tries to straighten out the line. From there to the next ball, and so on.
Mar
27
answered Does a photon exert a gravitational pull?
Feb
27
comment Equivalence principle and radiation from falling particle
Here is a Java applet that helps visualize what happens when a charge accelerates. Play around with it and it will help.
Feb
26
comment Equivalence principle and radiation from falling particle
Don't think about it from an energetic argument. Think about it from the perspectives of what the time evolution of the electric field looks like in the co-moving frame of reference and then from the laboratory frame of reference.
Feb
26
accepted Frequency of nomad planets passing within 30 AU of the sun
Feb
26
revised Frequency of nomad planets passing within 30 AU of the sun
LaTex not rendering again, attempt to clean up
Feb
25
comment Keeping air in a well
This is equivalent to constructing a shell around a planet at some arbitrary altitude. The pressure at the bottom of your hole will remain steady as long as the air pressure at the top is the same as the 'natural' pressure for that altitude.By which I mean if you start with some global specific (low) pressure at the top before you start digging, the pressure at the bottom of the hole will simply be the pressure you would get if the atmosphere was as much thicker as your hole is deep.
Feb
25
asked Frequency of nomad planets passing within 30 AU of the sun
Feb
25
answered Eliminating IR light reflection perceived by a steep viewing angle
Feb
16
comment Why does a window become a mirror at night?
The adjustment of pupil size is only a small part of the story (it accounts for perhaps a factor of 10 in the overall sensitivity). The eye actually becomes more and less sensitive by a much larger factor via other mechanisms. It is more akin to turning up and down the gain of the retina itself.
Feb
2
answered What are the practical applications of decoherence?
Jan
29
awarded  Scholar
Jan
29
accepted Why does electron-positron annihilation prefer to emit photons?
Jan
29
awarded  Supporter
Jan
29
awarded  Editor
Jan
29
revised Why does electron-positron annihilation prefer to emit photons?
added 85 characters in body
Jan
29
comment Why does electron-positron annihilation prefer to emit photons?
Yes..but that doesn't actually answer my question. In the low energy limit why are photon pairs preferred over gravitons or neutrinos?
Jan
29
awarded  Student