Physics

When we are flying, are we speeding or slowing relative to the speed of rotation of the earth?

Take earth orbiting the sun. The path that earth takes is an ellipse where the sun is at one of the foci. At one time, earth is the closest to the sun and moving the fastest, while at another time, earth is farther from the sun, and travels slower. My question is thus: Lets say you take the velocity at any moment and you seperate it into two components, one parallel to the line connecting earth and the sun (the r vector), and on perpindicular to the r vector. Since the force between earth and the sun is always in the direction parallel to the r vector, and always perpindicular to the perpindicular component of velocity, how does that component of velocity change from th…

Hi. I think learning long ago, that a flame cannot be smaller than a certain limit. How is the theory -or fact-? Perhaps that is the principle of operation of flame arresters, which are a bunch of small holes. If an explosion happens at the end of a hose carrying -say gasoline- vapors, would the flame propagate inside the hose towards the source of vapors and blowup everything; or if the hose is small enough it won't happen ? Is a burning explosive wavefront also prevented to propagate trough a flame arrester, of that is only for flames ? -if they are not the same- What prevents the flame of a bunsen burner to ignite the vapors in the hose all the way bac…

Does fusion have been observe in accelerator collision ? If I collide protons with enought energy will they fuse ? If yes wouldn't it take less energy than trying to confine a plasma to high temperatur ?

We all know that uranium undergoes fission to produce barium , krypton , and three neutrons.If these products are fused ,...Will they form the original Uranium molecule?? If so, a neutron can bombard with the new uranium to undergo controlled chain reaction.is it possible??????. Please help me.

Logically, I equate resistance with a frictional force inherent in a conductor. So, I would expect that resistance should be a vector quantity, antiparallel to the direction of the current. I liken this to the the frictional forces acting antiparallel to a force that pushes an object across a floor. However, my professor tells me that resistance is a scalar quantity. Why is this?

Seems like a stupid question, but I was wondering why there is no precise definition for a 'law.' Some examples of different types of 'laws': 1) Ohm's law, Hookes law: These are based on experiment and are true only in certain cases, for certain materials and in certain ranges. No real basis in first principles; only an effective description of what occurs. 2) Coulomb's law, Newton's 3rd law: Also based on experiment, but always true and seen as something fundamental. 3) Gauss's law: Always true, but can be derived from something fundamental (Coulomb's law or Newton's G law). Maybe we could say that Kepler's laws were originally type 1, but became type 3 after…

Hi, My physics class just covered projectile motion and this problem was like the at the end of lesson problem. We get a bonus credit if we get it right! I got the answer but I want to know if this is right (I got all the other projectile motion questions right so far though). * A basketball player tries to make a half-court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51.0 degrees, 14.0 m from the basket, what speed must the player give the ball? My Solution: Let the resultant vector be v. Then the horizontal component velocity vector is v*cos 51 and vertical is v*sin 51. Focusing on the vertical sid…

If a battery doesn't supply electrons or protons to a circuit but supplies "charge" which travels from the high potential (+) side of the battery, through the circuit ( e.g. a bulb), then finally to the low (-) potential side of the battery then what is this "charge" that the battery supplies? Thanks G56

I have heard that some hypothetical particles called "Tachyeons" travel faster than light. Is it true.

i've read a little bit of this but it hasn't been writin in "plain manswriting" yet for what i could find so i constantly find myslef looing up words and ending up reading a book for every word i dont know. So dark matter its self is a theory right? When i first heard of the general idea of dark matter i wasnt completely filled in on it and i developed my own theory to what it was, while debating with a friend we came to the conclusion that my theroy could be just as plausaable as the current "darkmatter theory" because E=Mc2 is a theory as well. any holes in this? i can type out my theory if anyone wants it just to fully understand this.

What do oscillations in a vacuum resemble or do they exist? I was just wondering about that in application to say chemistry experiments. Could you apply such?

2.1 Consider an array of N localised spin-1/2 paramagnetic atoms. In the presence of a magnetic field, B, the two degenerate spin states split by ±μB, where μB is the Bohr magneton. (i) Derive the single particle partition function for the system. (ii) Show that the heat capacity C can be written as C = dU/dT = NkB((D/T)^2)exp(D/T)/(exp(D/T)+1)^2 (here, Kb is Boltzmann constant) and find the value of the constant A. Show that C has a peak at a temperature Tpeak = AμBB/kB where A is a numerical constant. Determine A. I think I found the answer to part (i), which I think is 2cosh(beta*μB*B), where beta is just the greek symbol. However, I can't figure o…

Or violet, i dont think there is a major difference, but the former term allows an alluring alliteration. So i realized something very simple, which makes me wonder, but i am not a physicist so i fear the assumptions i make may be inaccurate. And i know there are differences in mixing colors of tangible substance, such as paint, and mixing or splitting colors in light. Purple comes from a mixture of red and blue. Now the part of the electromagnetic spectrum that is visible to our optic equipment goes ROYGBIV. My interpetation of this : there are three primary (or indivisible) colors : Red, Yellow, Blue. Orange is the blending of Red and Yellow, Green is the b…

Could anyone point out my mistake? Thanks. The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 40°C. 20 Hz = 1.07 m Your answer differs from the correct answer by orders of magnitude. 20,000 Hz = 0.00107 m Your answer differs from the correct answer by orders of magnitude. V=(331)*(sq.root of T)/273K T=40 C= 313K V=(331)* (sq.root of 313K)/273= 21.5m/s V=frequency*lambda Lambda=21.5/20= 1.075m Lambda=21.5/20000= 0.001075m

The purpose of Kundt's tube is to experimentally determine the speed of sound through metal. I understand the concept.. The distance between two successive patterns (Nodes) is therefore one-half the wave length of the sound in the air. My physics teacher asked us why we measure the distance between nodes and NOT between anti-nodes.... Frankly, I have no idea. Aren't they equivalent in length?

how is the earth not a perpetual motion thingy? what with it moving through space, presumably untill it desintegrates or the sun explodes? or is 'perpetual motion machine' more than just something that perpetually moves untill it breaks (i'm taking 'because it'll one day be destroyed' as a lame answre btw)

I'm not sure this is where this goes but any help would be much appreciated I recently hooked four 9 volt batteries together in a series circut, with the positives going to the negatives then on the end batteries I took 2 wires and put the ends in a small tub of water. After about an hour or so, one of the bottoms of one of the batteries exploded and shot out this powdery clearish stuff with a little bit of green in it. Does anyone know how I should do this so this doesn't happen? Should I do a parrallel circut (plz explain) or get a different type of battery? Also what is the difference between a watt and a volt?

Take a TV remote control and look at its front end and press a button. Can you see anything? No. Now do the same but look at it through a camera phone. You can see it flickering! Amazing huh.

Im not too sure how to word this so hang with me Well, my year. 8 science teacher is not the brightest bulb in the box, but he absouloutly stumped me with a question today; "Why is gravity there?". Is there even an answer for this? If I dont get a good answer by monday I have a lunch time clean up (long story). Am I crazy or is that an impossible task to set (especially for an 8th grader).

Basically I would just like to ponder the idea of using genetics along with microbes to produce machines. What I am looking towards I know sounds scientific if not old hat really as far as such is concerned. Really though what bounds would be in the way of engineering on such a level as to what you have may be bioorganic but only just such. I mean brain cells I guess of some type obviously could find use as say computer interfaces are used in modern machinery of various types such as automobiles. I mean if you could produced various microbes that ran various functions from a cyclic point of view going from of course stimulus that it could be preprogrammed for then the def…

I read that they are just like glow bulb electrical testers which requires a human touch to let us know the presence of electricity. So i started wondering if there is any way we can simulate the effect without a human touch, i mean say from a distance like a remote. Is that possible with a capacitance circuit in elevator?

What "pushes" the electrons through the wires when I switch on e.g. an electric kettle? And do the electrons travel at a certain speed in wires? Thanks G56

If you took red light (700nm) and mixed it with green light (400nm), would the resulting light have a wavelength of about 550nm (which would be a yellowish orange) - or would it just be an overlap of red and green light, the only "yellow/orange" coming about after the physiological effects have produced the perception of it? Putting this another way, I'm asking if the mixing of colors is a phenomenon that happens only at the level of our physiology (i.e. the visual system) or does it happen in very physics of light?

From my lab this week, I analyzed that the projectile motion is independent from the mass of the object and that it's not a factor in any equation for projectile motion. I said this based on my lab results. But I find it difficult to believe that it's true with my eyes. I don't know.. I just feel like heavier object, like car, will have less steeper projectile motion than soccer ball. Can anyone tell me if I'm right (and that my eyes, just like in other scenarios of physics, are deceptive)?