Physics

My high school physics teacher says that, when Newton invented the laws of universal gravitation, he devised a constant to be implemented when considering the gravitational relationship between two spacial bodies. According to my teacher, it was using this constant that was used to "find" the supermassive black hole in the center of the galaxy (by studying the behavior of the stars around it). He says that this constant's unit is kg^2/m^2 (kilgrams squared per meters squared); however, that's as far as his knowledge goes. He remembers virtually nothing about this constant, not even the numerical value of it, so I'm turning to you guys. 1. What is the numerical val…

I'm attempting to understand their difference, and their relationship. The Electomagnetic Specturm ranges from Gamma Waves to Long Wave Radio waves, and everything in between. Electromagnets and other kinds of electronic equipment and power lines give off electromagentic fields. My question is, are the electromagnetic fields emanating from electronic equipment and other electromagnetic sources, part of the Electromagnetic Specturm? If so, what portion are they in? If not, what is their relationship?

Here are two blog postings. One of them is good, one of them is rubbish. You can decide how I feel I will choose my words carefully in what follows... Either way, in talking with people who...think that...all of physics since Einstein is wrong, I have noticed a very disturbing trend. Specifically, these...people...seem to worship Einstein. This attitude is very...ridiculous---Einstein was a great scientist, but he was no smarter than any of the other scientists in the 20th century who revolutionized physics. The first article starts with this contention, that physics is desparately searching for a new Einstein, which is simply not true. http://grenoui…

Here's one that has been bugging me for a while now: In my tiny country (that nice little swamp at the end of the river Rhine) the winter months are crap. Usually above zero degrees (Celcius) and wet. The air humidity is generally at 90% or so. Why does wet air feel so cold? In fact, it feels less cold when it is -1 degrees, because the air is generally a lot dryer... is it me or is that tiny fraction of water really responsible for a major difference in heat transfer? At 5 degrees the vapor pressure of water is about 10 mbar, so the volume (or molar) fraction of water in air is <1%. How can it have an effect that I can really feel? The Cp value o…

I haven't heard some interesting new discoveries lately.

Shoot dry ice inside projectiles to the Moon with Rail Gun Technology to lower atmospheric Co2 on Earth to that of pre- industrial revolution values of 250ppm. If the 1/6 gravity of the moon can hold the Co2 to the Surface then an atmosphere can be formed and then seeds,water and nutrients can be added to start growing plants to make oxygen. My link

Everybody knows well light is bending when it passes nearby the very big mass star. But photon has no mass. Why light is bended by very big gravity star? Any related equation about it?

The following post explaining my comparison of weight and voltage as expressions of potential energy has been contested as being "gibberish:" What is gibberish? The idea that "electric charge 'pushes' against an insulator?" What else would it be doing while waiting for sufficient voltage to build up to the point of being able to spark across a gap in the circuit or some other insulator separating the conductors? Is it gibberish to say that "an obstacle preventing an object from falling impairs gravitational motion in the same way an insulator prevents an electric charge from flowing further within the circuit?" If a bowling ball dropped out of a helicopter is st…

What kind of force in the gravitation is any realation with magnetism ? can we create artificial anti gravitation on earth any possibilities???

ok.ajb , this is our praying time (friday is faithful day for us) and because of this I have to go to mosque just now, if it is convenient I will prepare and post them there ... thanks for your politeness. (--->> dear ajb I would express something about your personality : I see you trying very quickly to make answer for others.actually I appreciate this direction, and I think this showes that you are more and more energetic in comparison with others , especially according to age. don't miss this , this is very good.) :-) regards. **** * **** preparation before giving physical questions **** * **** ATTENTION PLEASE: THE PROJECT IS …

Are there any other things/objects in our universe that are massless other than Gluons and Photons? I guess energy is massless, but it's not so much a thing, more-so a property.

What is the gravitational time dilation at a point midway between two equal spherically symmetric masses m? For one mass, the time dilation is given by the tt component g00 of the Schwarzschild metric, and is equal to sqrt(1-2m/r)dt, where m/r is the potential. For two masses, however, I see two intuitive possibilities. First, you could simply take the sum of the potentials to get sqrt(1-4m/r)dt. Second, you could calculate first the time dilation due to one mass, then apply to that dilated clock rate the time dilation due to the other mass. This would be equivalent to taking the product of the two g00 components, with the result (1-2m/r)dt. These two values for…

Alright, there is a person standing there. I am intending to take a high resolution neuronal live cell imaging of the person non-invasively in real time. I've looked through all types of microscopy techniques, which, you know, requires you to look through a microscope without the neurons being blocked by the skull. With the finest detail being an electron microscope that is, but to look through a sample, you would need to generate a 3D mesh, so I look into spectroscopy, which generates a hyperspectral data based on the Raman spectroscopy if you know what I am talking about. So simple laser spectroscopy, how detail does it get? There is Raman spectroscopy and al…

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).

What will happen if you drop an atom in space? Will it stay put or start moving?

http://www.geekarmy.com/Science/Cool-Battery-Demonstration.html can anyone explain this? is it even Real? I wonder because only the B stream seems affected, so if both are Equal then what makes B so different?

This is a very serious question for all of you nerds. Who ever can answer it is the smartest nerd of all nerd. If i dig a hole through the Earth (from one end to another), then if i jump through it, will i fall out the other side or what? Because when i jump in it i will be falling DOWN but how could i come out the other side falling DOWN. Thats impossible. Someone please answer this question.

Ok, im a starwars fanatic, and as i was playing a game, i notised that the players could apply a shield field and be protected from bullets:eyebrow:. Now i have been doing some research on it and found this fourm, then i search for 'reverce magnet' and found this: Can a magnet be made to PUSH metal? So here i am wondering if you strip pyrolytic carbon to about 2 mm, would it lose any force from the orginal, i don't know, 1 sq. dm block, and, would it have the power to stop a bullet before it hit you? Thanks, -Iruka

I have one project of developing setup to lift heavy water at some height. A setup that take less energy as compare to traditional water pumps. I was searching on net and I found giant "water wheels" of ancient times to lift water. Like this one http://en.wikipedia.org/wiki/Norias_of_Hama Is this possible to rotate this with electric motor and make setup to lift water which is efficient than traditional water pumps? I was thinking that due to circular motion, inertia, momentum, centripetal force, etc might be this can be more efficient than traditional water pumps!. I thought it may require more power to move it from rest but once wheel gets momentum then it requires l…

A magnet is demagnetized. In a closed system there is a ferromagnet and two chemicals in a packet nearby. If the chemicals are exposed to one another thermal energy is generated. (There will be a decrease in chemical potential energy and an equal increase in thermal energy.) The increase in temperature will be enough to raise the ferromagnet above its Curie temperature. (There are no other strong magnetic fields nearby.) EN1 The chemicals are exposed to one another and the temperature increases. The ferromagnet becomes demagnetized. The demagnetized state is a higher energy state than the magnetized state. EN2 There is a decrease in chemical potential …

Space is determined as empty but that's judged based upon human opinions but is their nothing?? or is there gases or certain particles that our equipment just aren't advanced enough to trace??

A 1k body is totally isolated in its own universe. What is its temperature, consistent with the laws of Physics?

I have been reading a few rather dodgy threads pertaining to gravity. A question not related to those threads but induced by them occurs to me. Firstly assume you have a hollow space and are not being crushed or burnt to a crisp at the centre of the earth, the sun, or even a black hole Assuming the above, would a gravitional force be felt. Would you feel any gravity at the dead centre of the earth, the sun, or a black hole? My reasoning being there is a equal amount of mass in all directions from the centre of any mass and gravity would pull equally in all directions producing weightlessness perhaps inside your hollow space.

Should mass vanish if 0 Kelvin is actually enforced into a system?

In electricity, I often see + symbols and - symbols, positive and negative, I often have touched two positives together on a low voltage system, meaning a battery, to see sparks! Is it a correct assumption that two equal polarities can not touch and force each other apart? Does the Sun emit electrical energy? Does the Earth emit electrical energy? Does a positive attract a negative when talking about electrical energy?