Physics

Hey guys, I represent an online quiz game called 'Game Of Nerds' which I've developed over the last year with a friend and which we launched two months ago. The game (in which users can compete in 15 archetypically 'nerdy' categories such as biology, physics, chemistry, math, computers, science fiction, video games, etc.) is doing pretty well, but some of the quiz categories are lagging behind the others in number of questions, meaning that they're easier for players to just memorize. One of those categories is, you guessed it - physics. That's why I'm here - to encourage anyone interested to drop by and unload some of your awesome physics knowledge (as well as chemi…

Hey guys, I'm new to this forum and my name is Asma.. Can I have some basic information about sound?? Thanks

Hi SF This is my first post on the science forums and my question is a simple one, yet puzzles me everyday. I am planning next September on joining a university on a physics and astronomy degree. My question to fellow SF members is at 26 currently (27 next sept) am i too late to make a career in physical science? this is a career change for me but for as long as i can remember physics and science in general has fascinated me but has been kept has a hobby and a subject of some volunteer work. Any input on the matter would be very much appreciated.

Law of conservation states that total amount of energy and matter in this universe will be conserved. science knows that living organism also contain or made of energy and matter but by this conservation law science does not says living organism also conserve. what is your thought about it ?

w=R1, x=R2, y=R3, R4=z, s=R5, v=voltage of cell, a=voltage of point A, b=voltage of point B, then, Inputting"a-(a-s*((v-a)/w-a/x))=s*((a-s*((v-a)/w-a/x))/z-(v-(a-s*((v-a)/w-a/x)))/y), solve a" on wolframalpha, then a is found Inputting"(s*(b/z-(v-b)/y)+b)-b=s*((v-(s*(b/z-(v-b)/y)+b))/w-(s*(b/z-(v-b)/y)+b)/x), solve b"on wolframalpha, then b is found It is certainly correct as I have tested it many times. I had been calculating it for about 6 hours.(so crazy..... )

Assuming the voltage of the negative terminal is 0, how calculate the voltage of point A and B? And can anyone draw a simpler equivalent circuit for me. God bless the people helping me. picture beside, why am I not allowed to use the image extension on this board?

Are the changes of electric potential energy equal for a charge moved from point A to point B(electric potential changes) by every paths?

Analysis - the process of separating something into its constituent parts, has been the basis of modern science. Reductionism, as it became known, has been leading breakthroughs in science up-to this day. In 1922, a group of leading philosophers and scientists met at a cafe in Vienna, to discuss the scientific conception of the world. The Vienna Circle, as it became known, proposed the unification of science; these were the stepping stones of Systems Science as we know it today. Analysis was the past, synthesis and holism were the new buzz words. System science, today, is an interdisciplinary field of science that looks at things in a holistic perspective. Still relat…

Is it possible that space-time can be warped and curved differently from place to place in the universe? Euclidean space being flat and Minkowski is curved, So Pythagora theorem doesn't apply in curved space. But as s² = (ct)²-x² suggest that it's a universal law and all curves are the same everywhere in spacetime. Or does the curve warp? Sorry if this is a silly question but i was trying to decipher the curvage between an (all even) ball and a golf ball with indents. So given this, space-time may not be the same everywhere thus different for each observer. How does this relate to e=mc²?

Hello everyone. I have two questions, that I've been turning over in my head, I hope some one can clarify. The first one: When a particle (or some other quantum system) is in an uncollapsed superposition of states, do each of these states, when considered individually, have different (assumably very small) entropy values to one another? The second (unrelated) one: When the probability amplitudes of a wavefunction are normalised, must the sum always equal 1? Thanks!

My link Is it correct to say that R1 and R2 are in series , R1 and R3 are in parallel? God bless the people answering me. Is there a simpler equivalent circuit?

I read a line elsewhere that there was serious academic consideration over the possibility of variable laws of physics (over time). I'm not familiar with this subject. Can someone provide links to serious and scientific articles/essays/journals on this issue?

My link This is a the page of my exercise. After the switch is moved to position B, it says a parallel circuit is established, but circuit seems not completed because one terminal of the cell is not connected.

What is electric breakdown? Can anyone explain it briefly? The results from Google are too complicated and not understandable.

According to this site, "Helium can be formed by a set of reactions that cannot occur in the Sun's interior because it doesn't have any free neutrons" (rxn 3): Thus, could you enrich your cooling water, with tritium, to absorb all the excess neutrons, fusing into Helium, and converting wasted neutrons, into usable heat energy ??

Hi What were Heinrich Hertz's achievements besides the discovery of electromagnetic radiation? Did he had any?

Sorry if this is in the wrong section, I am new to the forum. My question is about magnets. I am looking at a few, pull force is about 40 lbs. What does this mean, and how does that relate to the repulsive force? Is there and equation to find out how much two magnets (40 lb pull force) will repel at different distances? Thank you.

I was wondering if someone could superpose a wave say of 350 nm wavelength with one so as to just bounce it into the visible spectra.

question: Your car is on a crowded highway with everyone heading south at about 100 km/h (62 mph). The car ahead of you slows down slightly and your car bumps into it gently. Why is the impact so gentle? answer: Your relative velocity is small—in your frame of reference the car in front of you is barely moving, so the impact is very gentle.

Would someone mind explaining a little bit about how an NNEMP works? The wiki page on EMPs (http://en.wikipedia.org/wiki/Electromagnetic_pulse) talks about how nuclear EMPs knock electrons out of the upper atmosphere and that these electrons are the source of technological damage (because they act too quickly for typical surge protectors to defend against and because (i'm assuming) the massive amount of electrons involved in nuclear EMPs). Why does knocking electrons out of essentially air, or low oxygen air anyway require a massive amount of energy?

please give me the proof of fourier series

I found some contradiction on my book the book states "PE of gas>PE of liquid>PE of solid" but also states "In a gas, where the intermolecular forces are weak, the internal energy is entirely molecular KE." why is the PE of gas not significant while it is largest among the three state?? HELP!

How can anything have intrinsic properties? lets take the example of the electron. The electron is thought to be an elementary particle. "It has no known components or substructure" Quote from wiki (bolded mine) It has mass, spin, charge, it has a twin brother with opposite characteristics but no inner components, they can anhilate and produce photons, they participate in 3 of the 4 interactions, and "when an electron is accelerated, it can absorb or radiate energy in the form of photons." How is it possible something that has no components or substructure to have so many (intrinsic?) characteristics?

So if I am traveling in a dark tunnel at the speed of light and turn on my flashlight, will I be able to find my way?

We know that when a circular object is placed on a ramp , it will " roll down the ramp ". How gentle or how steep the ramp is will affect the velocity of the object. My question is that whats the exact explanation for how the gradient affects the speed. My guess is it has to do with moments , am I right?