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Quality answers to common physics questions
Jul24-14 11:39 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
May6-14 04:32 AM
168 186,585
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
2 69,496
Two charged plates can't be made to repel each other right?
Nov5-09 12:01 AM
15 4,326
Recently in the news, there have been stories about the potential dangers of radon and radiation emissions from...
Jun8-09 03:05 PM
15 2,224
Gun is a kind of heat engine? if so ,the efficiency of a gun is limited by carnot heat engine?
May23-09 03:06 PM
15 2,201
I have a bike that has a mass of 100kilograms and its' wheels are 0.722meters in diameter. I am trying to calculate...
Feb4-09 11:55 PM
15 2,825
Now, I've asked about this on some other forums: and it seems all people are able to to is repeat what happens at...
Feb7-09 04:25 PM
15 1,220
One of the first things we learn is that the Earth rotates very quickly (about once a day). We, as very imaginative...
Feb17-09 11:54 PM
15 2,459
I need some clarification with voltage and current and how you calculate the voltage and the current. Also when you...
Mar8-09 02:44 PM
15 1,502
I am just wondering if matter cannot be created or destroyed that would mean that were are not making new energy we...
Mar15-09 11:07 AM
15 6,817
Why does the speed of light equal C? (ie. 3 x 10^8 m/s) Why isn't it 5 x 10^8 m/s, or 7 x 10^5 m/s, or 4 x 10^25...
Mar15-09 09:13 AM
15 5,278
I have a question concerning magnets. Lets say i have 2 magnets each wieghing 1 gram each sitting on a scale. The...
Mar25-09 02:20 PM
15 2,027
classically, acceleration towards the earth's surface is described by a=G*m/r^2 usually we think of using this...
Mar25-09 01:06 PM
15 1,962
My physics teacher today said in a nuclear reactor there is radiation called like sarencobe radiation I didn't hear...
Apr6-09 01:13 PM
15 1,254
I've read that no matter what force is acting upon an object, no actual "work" is being done unless the object moves. ...
Apr15-09 04:29 PM
Doc Al
15 1,525
Why can't light escape black holes? Isn't light as an electromagnetic radiation massless, thus not affected by...
May5-09 02:31 AM
15 3,247
Hi all, I'm implementing ray tracing .. If we say that an antenna is linearly vertically polarized, does that...
Apr23-09 10:45 AM
Bob S
15 2,780
I was curious if, when someone dies, are the informetion, such as memories, stored in the brain lost? Is it possible...
Apr27-09 07:47 PM
Count Iblis
15 2,730
Please excuse my naive use of algebra. R_{s}=c\frac{\phi_1 \phi_2}{r^2} I have concocted this equation in an...
May18-09 12:27 PM
15 1,950
Hello ! My friend challenged me to remove a sheet that is under a standing pen, without the pen falling. I can only...
May28-09 09:00 AM
15 1,299
Analogous to understanding of gravity in the days before Einstein, I know the effects of Charge and can even feel it,...
May30-09 08:12 PM
15 1,219
(Hot here refers to temperature, NOT the obvious radioactivity),Yes, perhaps a silly question, but maybe not. I...
Jun2-09 07:25 AM
15 2,856
This may be a stupid question or have a pretty obvious answer, but I can't seem to find one so I'll just go ahead and...
Jun4-09 09:30 AM
Count Iblis
15 1,807
Why does running before jumping help you jump higher? The only explanation I could think of was that right before the...
Jun19-09 02:29 PM
15 3,242
This came from a practice MCAT test and I thought about it for a while and was still confused, I have the correct...
Jun25-09 07:59 AM
15 1,251
There was an article in a German online magazine debunking the theories of moonlanding deniers. One of the issues was...
Aug4-09 11:42 AM
15 2,265
Ok so this is only my second thread (and post) on this site. My question is that if you push something that doesn't...
Jul23-09 05:48 PM
15 1,723
Okay so I was poking around the wiki for the video game Fallout 3 the other day when I came across this page: ...
Jul24-09 12:01 PM
Bob S
15 3,095
Is it possible to travel .999999999 repeating the speed of light , because that would be a 1 in math .
Jul26-09 02:14 AM
15 1,956
WARNING NOOB QUESTION FOLLOWS: Well this has been bugging me lately, as i have been doing research on maxwells...
Aug3-09 11:58 PM
15 2,165
Hello Is there a name for the equation that calculates how fast someone has to travel to move forward in time, say...
Sep16-09 06:46 PM
15 1,182
Hello, I have got an question. How can I calculate the velocity of an object which I'll drop from a height of 1...
Oct13-09 01:50 AM
15 11,186
Hi guys, Im trying to create a simple application for a college project based on an egg moving around a level...
Nov12-09 10:01 AM
15 2,486
someone told me that in 4-D, the Earth actually orbits around the sun in a straight line, could someone try to explain...
Nov27-09 01:01 AM
15 3,692
I was using my iPhone when I got to thinking about how amazing it is that so much information can be transferred all...
Dec6-09 05:15 PM
15 2,296
Question about Gamma Radiation. I understand that Gamma Radiation, like X-Rays, are just photons (light particles) at...
Apr28-11 03:50 AM
15 2,445
I want to make a DC current (from a battery) oscillate between full voltage and zero voltage (not negative) really...
Apr14-11 09:18 PM
15 1,891
On an inclined sheet of clean glass (or Teflon, or a simonized car, etc.) a trickle of water flows, not in a straight...
Apr27-11 02:22 PM
15 2,771
I am trying to undestand something basic here. Newton formulated his second law as: The rate of change of momentum...
May7-11 08:00 AM
15 2,410
I was wondering would it be possible to have more than one rainbow within the same area so another - that two rainbows...
May8-11 10:08 AM
15 1,522
Physics gurus: I understood from Newton's Law that a 2 bodies would rotate around their common center of mass. Should...
May13-11 01:08 PM
15 2,314
take a cunductive wire. coil it (for conventional space) then run electrons through it with 8.98755179 10^16 J ...
May21-11 10:07 PM
15 2,051

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