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Physics Help and Math Help - Physics Forums - www.physicsforums.com | Site profile
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Posting activity table on Physics Help and Math Help - Physics Forums:
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3 Months
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Physics Help and Math Help - Physics Forums posting activity graph:
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Top authors on Physics Help and Math Help - Physics Forums during last week:
user's latest post:
Optimization Problem
Published (2009-11-07 01:55:00)
I would advise you to continue with what you were doing, as it is a pretty straightforward way to go. As phyzmatix pointed out, you formula for the volume is incorrect. Your formula will give you the area (not volume) of the rectangular sheet, since you are just multiplying the length of the sheet (the circumference of the cylinder) by its height. The volume of the cylinder is the area of its base times its height.
user's latest post:
Showing that a surface is a...
Published (2009-11-07 05:07:00)
No matter what r and t are, x is always 4. The disk is in the plane x= 4. A normal vector to that plane is <1, 0, 0>. That is also normal to the YZ plane.
user's latest post:
One of These Things is Not Like...
Published (2009-11-06 13:03:00)
Originally Posted by Quixotic My first guess too, but we're looking for a basic, common feature, and what's even simpler is that Spoiler all the figures except C feature triangles. Or is that too simple? Personally I think my answer is more elegant. I think the answer you gave is too ... trivial. You could go even simpler and say c is the only one with no diagonal lines.
user's latest post:
Sum of torques/friction problem
Published (2009-11-07 07:09:00)
Originally Posted by ddn87 and since It slips at 52 degrees i believe that is kinetic friction.... rather than the static friction coefficient which i am trying to find out. No, all you need to worry about is static friction. The ladder is at the point where it is just about to slip, so static friction is at its maximum. If i go thought the sum of torques equation i find out that the force force of friction in the x direction should equal the...
user's latest post:
Confused about charged rotating...
Published (2009-11-07 03:43:00)
Hi fluidistic! Originally Posted by fluidistic … what if the Universe is made of the disk, a person in front of it, and me over the disk? Would I still be considered as a non inertial frame of reference? (yawn … just got up … must eat … ) hmm … you're talking about the Mach principle , the Gödel rotating universe , and so on … how do we decide whether the disc (and you) are...
user's latest post:
question about brewster's...
Published (2009-11-06 21:19:00)
Originally Posted by kor YUP That's brewster's law but what's the principle behind it ??? What's the fresnel coefficients ??? Fresnel's equations for the transverse E and H components of light match the incident, reflected and refracted tangential components of E and H at the boundary. Bob S
user's latest post:
Gas mixture problem
Published (2009-11-07 04:29:00)
Originally Posted by Light bulb the volume of 1 mol of gas is 22.4 L, so you have .123 mol of helium That's volume at STP, it doesn't hold in general. Question is ambiguous and wording is tricky. The only correct answer is "for none". -- chemical calculators - buffer calculator , concentration calculator www.titrations.info - all about titration methods
user's latest post:
Re: Troubling Coverage of the...
Published (2009-11-07 00:51:00)
While we don't really know his motives yet, I am very annoyed at the news channels that seem to be trying to dismiss his actions as somehow explainable because he was called names...yeesh...he's a psychiatrist, he should know how to handle stuff like that. I've even seen some people trying to blame it on a stigma in the military about mental illness hindering him from being treated for some underlying problem. Again, he is a...
user's latest post:
Re: can 1 = 2 ??
Published (2009-11-06 13:48:00)
No, 1 cannot be 2. Normally they say "2 in 1" or "3 in 1" but never vice versa.
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Top 10 active forums on Physics Help and Math Help - Physics Forums during last week:
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Top 10 forums on Physics Help and Math Help - Physics Forums:
General Discussion
- 189,943 posts
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Academic & Career Guidance
- 96,468 posts
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Politics and World Affairs
- 84,850 posts
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Special & General Relativity
- 76,102 posts
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Introductory Physics
- 68,374 posts
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Quantum Physics
- 66,251 posts
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General Physics
- 60,531 posts
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Calculus & Beyond
- 56,094 posts
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General Math
- 50,110 posts
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Philosophy
- 47,287 posts
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Latest active threads on Physics Help and Math Help - Physics Forums:
Started 3 months, 2 weeks ago (2009-07-24 16:15:00)
by DaveC426913
And flying cars will still be 20 years away .
Started 2 days, 16 hours ago (2009-11-07 08:41:00)
by kev
Originally Posted by YellowTaxi
45 degree mirrors in Special Relativity
If a moving 45 degree mirror is length contracted doesn't that mean a ray hitting it from the front will appear (from the stationary observer) to contradict the laws...
Started 2 days, 16 hours ago (2009-11-07 08:40:00)
by superpaul3000
It appears that you are just rambling. I don't see what you mean by analog based mentality. Technically our mentality is both digital and analog. The signals that pass between neurons or continuous waveforms (analog). The information stored on the brain is digital in the sense that it is quantized but digital still means something totally different. So I guess the answer to your question is, on...
Started 2 months ago (2009-09-05 00:32:41)
by HallsofIvy
Or, if you want to get "fancy", a proof by contradiction: Suppose that is not empty. Then there exist a pair, (a, b) in such that which contradicts the fact that is empty.
Started 3 days, 2 hours ago (2009-11-06 22:46:00)
by HallsofIvy
No, that proof does NOT "imply that the students know the test will be given Monday". Because the teacher said "the students will not know for sure the quiz will be that day until they come to the classroom", they cannot know that!
This is a very old problem and I doubt that your teach really expects any students to come up with an answer.
Started 2 days, 22 hours ago (2009-11-07 02:01:00)
by Dmitry67
There should be no paradox and time does not 'flow' or 'move'.
As 'block time' is commonly accepted: http://en.wikipedia.org/wiki/Eternal...osophy_of_t ime )
As time does not flow then all the events in Closed time-like loop must be consistent from the very beginning. In another words, when you try to kill you father, you suddendly change your mind, or it does not work, or forget the ...
Started 6 days, 19 hours ago (2009-11-03 05:48:00)
by xepma
Time evolution of the wavefunction is dictated by the Schroedinger equation. You don't need an environment from that.
Besides, you cannot really talk about a static state of a closed system anyway. There is always some internal stuff going on.
Started 1 week ago (2009-11-02 06:01:00)
by dx
Originally Posted by lubuntu
More often than not most of what we are learning is not even really true anyways.
Really? Can you give an example?...
Started 3 days, 10 hours ago (2009-11-06 14:18:00)
by Bob S
In an RLC circuits, the voltage across the inductor is given by V = L dI/dt, and the current in the capacitor is given by I = C dV/dt. In an LRC circuit flows back and forth between the inductor and capacitor without loss, like the pendulum in classical mechanics. Energy loss in the resistor is like damping in the pendulum. the resonant frequency is given by 1/sqrt(LC) in radians per second...
Started 2 days, 19 hours ago (2009-11-07 05:53:00)
by frankinstein
Originally Posted by sudar_dhoni
relativity states that as v approaces c mass increases
but my question is that if we are going fast and suddenly mass increases then simultaineously we must slow down and thus we will be back to original ...
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Hot threads for last week on Physics Help and Math Help - Physics Forums:
Started 1 week, 2 days ago (2009-10-31 11:17:00)
by Chi Meson
I applaud your efforts in not wasting unnecessarily, but if this is happening a lot, then maybe you are coasting a bit too slow. How slow, anyway? 15, 10, 5 mph? Do you have automatic transmission? Sometimes just coasting with automatic makes the car go faster.
I'd personally get a little irked if it was so slow that I'd need to brake while "idling" forward.
Remember, there is more ...
Started 6 days, 18 hours ago (2009-11-03 05:58:00)
by JoeDawg
Originally Posted by vectorcube
I say the premises are pretty reasonable.
On what basis?
I think sometimes when people spend lots of time doing math, they start thinking that math is more ...
Started 1 week, 3 days ago (2009-10-30 17:08:00)
by Sorry!
Originally Posted by General_Sax
Is my experience the norm? In the future, should I flagrantly disregard the rules and continue to write an exam until they rip it out of my hands?
I wouldn't ...
Started 1 week, 4 days ago (2009-10-29 11:25:00)
by DrChinese
There have actually been surveys done on this here. And I have seen some informal surverys as well. In many ways the most popular answer may be "Don't know, not sure if I should care". Not saying that is my opinion or that most specialists hold that view, but I would say it reflects the viewpoint of a lot of working physicists.
Started 5 days, 13 hours ago (2009-11-04 11:41:00)
by Alfi
I would suggest a 'How to become ..' should be supplemented with a 'Why you should become ...'
Started 5 days, 17 hours ago (2009-11-04 07:49:00)
by Borek
Human being descendants of apes?
Not that it freaks ME out, but for sure the idea is a pain for many.
Started 1 year ago (2008-11-09 11:25:00)
by CaptainQuasar
I'll start us off with one I don't think should be too hard:
Started 6 days, 9 hours ago (2009-11-03 15:37:00)
by marcus
"The most widely accepted cosmological theories predict that matter also clumps on a larger scale in the so-called ‘cosmic web’, in which galaxies, embedded in filaments stretching between voids, create a gigantic wispy structure....
These filaments are millions of light years long and constitute the skeleton of the Universe: galaxies gather around them, and immense galaxy clusters form at ...
Started 3 days, 5 hours ago (2009-11-06 19:11:00)
by Pengwuino
You need to be careful about which mass you're talking about. Also, it's the acceleration that is the same, not the speed. Although if both objects are dropped with the same speed, then they will continue to have the same speeds (although both speeds are constantly increasing) through their falls. The force a mass , for example the Earth, exerts on a second mass, , say for example a ...
Started 4 days, 1 hour ago (2009-11-05 23:25:00)
by DavidSnider
Originally Posted by sportsstar469
i was talking to my friend whos failing chemistry. im getting an A in the class so i try to help her out. a nyway we were discussing why she got an 18 percent on her last exam. t urns out she ...
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