Short Definition and 505 Threads

Can someone give me a short description about dihedrals? for example what would be the elements of D10? or D4?

Homework Statement This is starting to get a bit trick because of mixed information. Anyways, does anyone know the effects of osteoporosis in terms of short term versus long term? Homework Equations N/A The Attempt at a Solution Spine fractures caused by osteoporosis are likely...

Idea for a short story. Say you had a colony ship that had its atmo contained by acceleration alone. It had an atmo that was comparable in depth to a planet. (Don't worry about it escaping, just help me with the radiation aspect.) Think of Niven's Ringworld. How much radiation would...

Homework Statement "find a point P on the parabola x^2-4y = 0 for which is minimum the distance PO/PF, where O is the origin and F the focus of the parabola" the solution is P(0;0), coincides with the origin, this is also clear graphically. The Attempt at a Solution Please follow...

Okay, I am really curious as to how you solve this question, I can't seem to figure it out. I am sure most of you will think it's a piece of cake, but I'm not a physics person at all :p If the suitcase was lifted 0.75 meters, how much force was required? (Hint: Use the equation for "work")...

I don't understand something on this problem: Q: A uniform plane wave with \vec E = \hat x E_x propagates in a lossless simple medium ( \epsilon_r = 4 \,\,\,\, \mu_r = 1 \,\,\,\, \sigma = 0 ) in the +z-direction. Assume that E_x is sinusoidal with a frequency of 100 (MHz) and has a...

I'm confused based on what I've been reading. Does short-range order for a crystal change when it is melted, or is onyl long range order affected by the state of matter an melting has little to no affect on the short range order of the crystal. Is that right or does the shrot range order change...

hey can you find the phase/gain margin of unstable system. I am asked for the phase margin of this system, but the nyquist plot reveals that -1 is encicled verfiying that the system is unstable,.. how can you get a phase margin of an unstable system?

So I had an argument with a friend, more like a discussion where we disagreed. It led to some interesting questions, or at least they are to me. I made a simple electromagnet using a battery, a nail, and an insulated copper wire wrapped around the nail many times with the ends of the...

http://www.shodor.org/~jingersoll/weave4/tutorial/tutorial.html

Hey guys, Since i all know i am going to be a "star actor" (please no laughing now). I give you this link of a movie in which i played. It is made by students from Sint Lukas in Bruxelles. Ok, the movie is very short and it is in Dutch but i think that the plot should be clear if you...

integral identity if we have \int dt f(t) = \int dt g(t) where both integrals are indefinite integrals, can we immediately conclude that f(t) = g(t) ? I know this doesn't work with definite integrals.

If I set up an interference experiment and make one path much longer than the other would I still see an interference pattern? If so why? It would seem to me that having one path very long would give which-way information because you could easily time the photons to see which path it went...

how is (tan X)(cos X) = (sin X) false? tan is sin/cos so when you multiply by cos, you get sin...yet the answer i was given was false? how so?

I am a HongKonger. My chemistry teacher comes from Canada and he wears short sleeves shirt every day, even when the temperarure is 10 degree Celcius. May I know is it true that Canadians still wears short sleeves shirt at 10 degree Celcius? I feel freezing. They are very strong...

express (2^1/2-1)^10 in the form k^1/2-(k-1)^1/2 where k is a positive integer.{the square roots need not be irrational}we can do this by binomial theorem but it is very tedious.is there a short & appropriate method to solve this problem?

what is short circuit and wat happens to different circuits when it occurs.wat operates it .

Could someone explain in a short and simple way the basic operation principle of a TEM?

Can somebody answer my question in a unique word? Are stars considered black bodies?

According to the equations, the tension of a string depends only on the the force acting (pulling) on it, and not on the length of the string. So why can someone with a bow and arrow with a long string (long bow) exert more force on an arrow than a bow with a short string (short bow)? Does it...

The statement, "when a resistor fails, it will normally open." is true. But I don't understand: when a resistor fails, doesn't that mean that the resistor doesn't work? so doesn't that mean that resistance=0=short circuit?

What exactly is an echelon matrix? I searched the web and did find some useful results but I'm still a little confused. :confused: Thanks in advance for any help. :smile:

Hello folks. The hinge for a story I am writing is based on a theory that I can't back. It's not entirely original, but bear with me. With this machine, you could recreate any combination of energy that has ever existed - and therefore any object/being. The only thing I have going...

What does an " ')' expected " error signify? How did I not use parentheses correctly? The error is in this line: System.out.println(num1 + " " + num2 + " " + num 3 + " " + num4 + " " + num5) ; What possible mistake can there be in parentheses?

I'm not very knowledged in genetics, although I'm interested in the subject, and was hoping someone could give me some insight into any possible reasons for why I'm short. I'm a caucasian male and I'm only around 5'7". I know I take after my father who is also around my height, but I don't...

Guys can post on the poll. It is separated so we know what guys and girls think. I'm a guy and I think we should have short hair. I have long hair myself, which goes past my eyebrows. I personally want it to reach the bottom of my eyes. I really like short hair, but long hair feels good...

*I don't know who's familiar with the AP system, but does anybody know any good review books for the AP Physics C test? (NOT the "B" Test) *I've found books that prepare for BOTH tests, but there is a large difference between AP Physics B & C, and I'm hoping for a book that discusses just...

What's the difference between a short circuit and a parallel circuit? In a short circuit, my teacher told me that no current will passs through the more resistive path. I doubt it. If this is wrong, then I could distinguish the difference and similarities between them. If not, I really need...

could anyone please give me a short summary of econometrics and what it uses to "predict" future economic states? thanks

I am designing a 500mA source circuit using a npn and pnp transistors. How can I protect the pnp if the output is shorted to gnd. Both transistors are in common collector configuration.

This may be an odd post, but I'm writing a short film in which a college student is having some trouble with a general physics course. Having never taken physics myself, I'm looking for sample dialogue to use in a particular scene. What I need help with is the professor's dialogue in this...

Here is a paper on the arxiv, preprint of an encyclopedia entry, which might be useful to many to introduce the ideas and techniques used in perturbative quantization of different fields. If you are content to accept for the moment brief definitions instead of leisurely motivations of the...

I would appreciate any type of feedback to this short informal survey. 1. True or False: Before visiting ecommerce sites do you have a preconcived idea on what you are going to purchase? 2. On ecommerce sites which do you use more often: Category Navigation or Search? 3. True or False...

I am about to purchase a devise to use for the detection of tin coating on window glass. I am a glass artist who fuses glass in a kiln. I know that, in the manufacturing process of the window glass, a tin coating is applied to one side . For my work, I need to know which is the tin coated...

In a short story by Kazakov called "The Blue and the Green", the main idea is: - guy falls in love with girl when young - girl dates guy for a few years and they fall in love - they move apart, and eventually girl dates other guy. - girl marries other guy and main guy sees them at an airport...

Does anyone know any famous SHORT STORY authors who are from any country BUT NOT england, france, ireland, scotland, or north america? thanx

one reason it's good is that it is written for the Wiley "Encyclopedia of Physics" http://arxiv.org/abs/physics/0503245 Neutron Stars Gordon Baym, Frederick K. Lamb Comments: Encyclopedia of Physics 3rd ed., R.G. Lerner and G.L. Trigg, eds., Wiley-VCH, Berlin Abstract: "This short...

This is Marys Peak, about 20mi west, and the highest point in the Oregon Coast Range http://home.comcast.net/~rossgr1/Maryspeak.jpg My front yard, it ought to be a lot better in a day or 2 http://home.comcast.net/~rossgr1/Magnolia.jpg The rest are just in the neighborhood...

I can`t seem to find any information on how to calculate the magnetic field outside a real finite solenoid. I do not need the field on-axis, but rather perpendicular to the solenoid. Any ideas on how to proceed, or suggestions to literature? Thanks Indian

I would like to invite people who want to study Bohm's theory in this thread. The aim is to *study* the theory, because people who (think they) are confortable with quantum theory (such as me) sometimes don't know much about Bohm's formulation of it (such as me!). As there are some proponents...

What is it that allows longer wavelengths to travel further than shorter wavelengths? Is it because of diffraction properties or is it related to the energy of the wave? Or perhaps a combination of several things...? Thanks. Russ

http://img158.exs.cx/img158/5127/prob9cx.jpg 2pi/3 the period right?

How many positive integers less than 500 have exactly 15 positive integer factors? I know the answer, but not sure it. Can you give me the answer ?

A man holding a book is walking, what's the work done on the book by him? Is this should be accounted into the work done by friction but not by the man? Cheers

All true... A gynecologist named Lichman A Financial manager named Joe Economy Harry Dong. His parents immigrated from China after WWII. They idolized President Harry Truman Short Electric Company.

Can somebody give me a short defination of youngs modulus? I think its the way a material acts under pressure, is this correct?

Nice AP Phyiscs prob. If V (elec. potential) equals a constant throughout a given region of space, what can u say about E (Elec. field strength) in that region? I think its also constant ;) ...but i was woderin if i was right

Not sure if any of you have seen it, but it had me laughing for a while: http://www.cs.wisc.edu/~kovar/hall.html Enjoy!

General physics: Someone please explain what a "short circuit" is I am currently reading electricity and although I have read my textbooks well, I still don't understand what a "short circuit" is..thanks :cry:

Hi all, I'm currently doing some work trying to optimize coils (basically a large center hole solenoid) for a series of experiments. Two of the variables I'm going to be able to adjust are wire gauge of the coil and amperage through the coil. Online, I have found 'rule of thumb'...