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General and Special Relativity
Relativity is the theory stating that all measurements depend on the relative motions of the observer and the observed. The theories of general and specific relativity were both proposed by Albert Einstein.
813 Questions
Wavelength = (speed of light) divided by (frequency) = 3.003 meters.
The wavelength of the signal is not affected by the shape, size, or complexity of the antenna array.
But depending on the phase difference between the signals radiated from the two towers, the station's
signal will be louder in some directions and weaker in other directions. By manipulating the phase
difference, the north-south line can be the direction of maximum or minimum signal strength.
No, typical small pickup truck springs are not large enough to compress about a half meter.
What is the definition of lenght?
In physics lenght is one of the fundamental quatity that means the measurements or extent of something from one end to another end
If the train is moving at 50 mph and the passenger is walking at 2 mph, people on the train would see her moving at 2 mph, while people outside the train would see her moving at 48 mph. 50mph - 2 mph = 48 mph
Which quantity in the equation E equals mc2 represents the speed of light?
Speed of Light is represented by c. It is a constant, and is equal to 299,792,458 meters per second.
What is the lorentz transformation used for?
The Lorentz Transformation is a physics term. It describes how, using special relativity, two different observers can translate each other's observations of one another into a space-time reference. It comes into significant play when the relativistic speeds of the two observers is close to the speed of light, but it can also come into measureable play at lower velocities, such as the velocities of GPS satellites relative to an observer (GPS receiver) on the Earth.
What is the formula for Lorentz contraction?
Lorentz contraction, or length contraction, coresponds to following formula:
l = l0 * sqrt(1-V2/c2)
Light will be reflected at an angle of 30deg from the normal. We can work out the angle of refraction using the formula: n(1) sin(incident angle) = n(2) sin(refracted angle) We will assume the refractive index given is the relative refractive index n(2)/n(1). So sin(30)/1.5 = sin(r) r = 19.5 deg As the reflectedd and refracted rys are on the same side of the normal we can subtract them from 180 to get the angle between them: 180 - 19.5 - 30 = 130.5
What is the partial pressure of helium?
The pressure that there would be if all the non-helium atoms and molecules were taken away.
It depends on how many ppl they have on set so yall jus gonna have to be pation
How much is gravity reduced as distance increases?
Gravity is inversely proportional to the square of the distance.
What did general relativity predict about the orbit of Mercury?
The orbits of planets have a point called the "perihelion", which is the point where the planet is closest to the sun. Over time, the perihelion of Mercury's orbit changes position, orbit around the sun itself.
General relatively correctly predicted that the shift in the perihelion of Mercury's orbit is much faster than is predicted using Newton's laws.
Silver is used in Ayurveda as "BHASMA", which is very effective in Auto Nervous system disorders and in Brain anomalies.
Did albert einsteine fail high school?
No he did not, he did have poor grades throughout high school because he had dyslexia. However on a high school exam in 1895 he failed the liberal arts portion of the test. In 1896 he was awarded his high school diploma.
If time slows down as you approach the speed of light does time stand still for light waves?
Time doesn't slow down.
When you move past an observer, he will notice that your clock is running slow.
But you will also notice that his clock is running slow.
I agree with you . . . this doesn't make sense, and it can't be. Unfortunately, it is.
Now, about that light wave. If we look at the question closely and carefully, it evaporates like smoke.
What in the world does it mean to say "time stands still for light waves" ?
It may help if we give you another basic fact about Relativity, and let you chew it over some more:
Anybody in motion . . . no matter how fast he's moving, as long as he's not accelerating . . .
experiences everything to be normal inside his capsule. There's no test he can do that will
tell him whether or not he's moving. And the speed of light . . . whether it comes from his own
flashlight or from anybody else's . . . is always the same: it's always the speed of light.
Does albert einestine have a wife?
Einstein was married twice.
He divorced his first one with the promise that she would get the money he would win from his Nobel Prize -- which she did, in fact, receive.
They see your body exhibiting exactly the same effect. According to all of their measurements,
you're moving past them, and you're squished in the direction of your motion.
And everybody is correct.
What particles are gravity natural?
If by "gravity neutral" you mean "not affected by gravity" the answer is none. Gravity is an attribute of curved space-time and thus everything in space-time is affected. Even massless photons curve in the presence of massive bodies.
What is the formula of frequency in simple harmonic motion?
Check out Wikipedia.org, "The World's Encyclopedia"
simple harmonic motion >> http://en.wikipedia.org/wiki/Simple_harmonic_motion
Why is zero important for Einsteins theory of relativity?
Without Zero it would be impossible to measure anything.
How long does it take to fall 2712 feet?
If the air isn't slowing you down and the only force on you is the force of gravity,
then you fall 2,712 feet in 12.98 seconds. (rounded)
If a beam of light strikes a perfect black body, it will be absorbed and, therefore, you will have been able to "stop light in air" as was asked. If your question is about stopping the beam and holding it in place in some way, you cannot. The speed of light is a constant, and will be found to be the same in any inertial frame. If you could measure the speed of a beam of light and were moving "along side" the beam to measure its speed, you'd find it a constant no matter how fast you were moving. Stopping a beam of light in air is not something that can be done as asked.
Which direction does magnetic fields flow?
I think it is a mistake to refer to magnetic field 'flowing. Magnetic fields just are, they can change, and these disturbances might move in space, but the field itself does not flow.
That being said, and assuming you meant to ask in which direction a magnetic field points the answer is that a magnetic field points towards the south pole of a magnet and away from the north pole. A magnetic field cannot be divergent (i.e. there are no sources) and any field line must be closed.
Do photons have physical mass?
- Photons have mass.
- Photons have momentum.
- Photons have energy.
- Photons are affected by a gravitation field and follow a curved path called a geodesic. (A geodesic is a straight line in curved space, so what you call curved depends on whether you are a geometer or if you are watching from a distance.)
- Photons have a gravitational field of their own which exerts an attractive force on other matter.
- Photons interact electromagnetically with matter and other photons.
- Energy of a photon equals Plank's constant times the frequency.
- Mass of a photon is equal to energy divided by the speed of light squared.
- Higher frequency photons have more energy and hence more mass and it is well known that sometimes the energy of a photon can be converted into a particle with mass (usually in pairs).
- Photons have zero "rest mass" but that is not the "mass" in E=mc2. It is not rest mass that determines momentum or energy or gravitational attraction.
- And, photons are never at rest.
- If you accelerate to "catch up" to a photon, the photon does not appear to slow down, but its frequency decreases and energy decreases, approaching zero (same as the "rest mass" as you approach the speed of light.
All that is true, but it is also true that characterizing any of these in a proper theoretical framework will inherently involve quantum mechanics, special relativity and general relativity.
Addendum:If the question is posed as to whether photons have "physical mass," one must ask for a definition of nonphysical mass. There is mass, just mass, and there is no circumventing "mass." It does not come in types or flavors or with provisos. Mass is mass.One more thing for the questioner:
Photons are quanta of energy, photons are not matter. They have mass since energy has mass. Mass as a property of energy is no different than mass as a property of matter. [Great summary of photon properties above]
