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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
How does Einstein's theory of relativity make warp speed possible?
Well I'm no expert, but the theory of relativity states that light is the only thing that doesn't move relative to another thing. For example, if you saw light passing you by while you were moving 200 m/h, it would appear to be moving at the same speed as if you were moving at 100 m/h. So theoretically, warp speed would be accomplished by moving faster than the speed of light, essentially moving faster than time itself. But Einstein's theory actually states that nothing can move faster than the speed of light, let alone at the speed of light. And so far this seems true; scientists have particle accelerators that have reached about 99.8% the speed of light, but never actually at speed.
So in short, Einstein's theory of relativity, specifically the second postulate, does not make warp speed possible. As a matter of fact, it makes it impossible.
But like I said, I'm not an expert in any way, so don't take any of this too seriously.
One way in which "warp speed" could be achieved is by the bending of space time, so if you "bent" the space-time continuum in front of you, jumped in, traveled a bit then unbent the space time, then you could theoretically be a lot farther than you had not been inside the bend in the continuum. I think.
What speed would the effects of special relativity be most obvious?
The effects of special relativity would be most obvious at speeds close to the speed of light (approximately 300,000 km/s). At this high speed, phenomena like time dilation and length contraction become significant, leading to observable differences in how time and space are experienced compared to slower speeds.
What is the relation between inter planar distance and cubic edge?
The interplanar distance is the distance between parallel atomic planes within a crystal lattice. It is related to the cubic edge length by the Miller indices of the planes and the crystal system. In cubic crystals, the interplanar distance can be calculated using the formula: d = a / √(h^2 + k^2 + l^2), where 'a' is the cubic edge length and (hkl) are the Miller indices of the plane.
A gas vortex is a swirling flow of gas that can occur naturally in certain environments, such as in the atmosphere or in industrial settings. It is characterized by a rotating movement of gas particles around an axis, creating a distinct pattern of motion. Gas vortices can affect the dispersion of pollutants, heat transfer, and mixing of gases within a system.
How much work is done in holding a 1 kg object 2m above the ground?
The work done in holding a 1 kg object 2m above the ground is 19.6 Joules. This is calculated using the formula: work = force x distance, where force = mass x gravitational acceleration and distance = height.
Why do you need to sort things out?
Rarely does a day go by when you do not have to sort some thing out. Sorting out can be done mentally then physically, or just mentally. It is having to make up ones mind as to the best course of action to take and then doing it. Sorting things out puts things in their proper order thereby making life easier.
How can you accelerate to the speed of light?
A person cannot travel the speed of light because a propellant to move a space ship in the vacuum of space would have to travel faster than light speed. Since everything is relative, nothing travels faster than light speed (speed C).
If light, for example, was to power a space ship by pushing on giant panels it would still not be able to push the space ship fast enough to travel at light speed.
If the energy was in light, enough to push a spaceship to almost light speed, it would still not have enough energy to push the space ship to light speed. It would still be slower.
Think of light speed like this: If you wer an ant walking as fast as you could and we make this the speed of a jet liner, light speed would still be the speed of the Earth going around the sun. The speed of light is vastly faster than any machine ever made.
When a cube of ice is heated what happens?
Its particles have more thermal energy, and thus melt and change states of matter into a liquid, water.
If heat continues to be transferred, it will turn into a gas.
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The above answer is correct in terms of physics but in terms of chemistry the electrostatic bonds are broken by the heat since the energy is enough to overcome the strength of the bonds. As a result the solid becomes a liquid and then a gas depending on the temperature increase.
What forces are combinations of pushing and pulling forces?
Tension and compression forces are combinations of pushing and pulling forces. Tension forces occur when an object is being pulled apart, while compression forces occur when an object is being pushed together. Both forces act along the length of an object, causing it to either stretch or compress.
How does the weight of a body vary with its position on earth?
Weight is measure of the product between the body's mass and acceleration due to gravity acting on it. This acceleration due to gravity is different at different locations on earth. And hence is the weight. Poles are said to have higher acceleration of gravity.
1.5 x 1011 meters = 1.5 x 108 kilometers
Does the mass of a speeding object increases in space when accelerated?
If you measure the mass of a movjng object as it moves through your laboratory,
you'll always find that it has more mass than it had when it was just sitting on the
shelf. The faster it's moving through your laboratory, the greater its mass will be.
It doesn't matter whether it's accelerating or not.
Define refractive index in terms of light?
Refractive index is a measure of how much light bends as it passes from one medium to another. It is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium. A higher refractive index indicates a slower speed of light and more bending.
What is the displacement of x and y?
The displacement of x is the change in position along the horizontal axis, while the displacement of y is the change in position along the vertical axis. These displacements are typically measured in units such as meters or feet, and can be positive (movement in one direction) or negative (movement in the opposite direction).
Before the shot, total momentum of the rifle/bullet system is zero. Momentum is conserved, so must total zero after the shot. Magnitude of momentum = m V (mass, speed); we'll take care of direction independently. Momentum of the rifle: m V = (3.8) x (2.4) = 9.12 kg-m/sec backwards. We need momentum of the bullet = 9.12 kg-m/sec forward m V = 9.12 ===> V = ( 9.12 / m ) = ( 9.12 / 0.013 ) = 701.54 m/s forward
In a short answer, no. There are no known examples of time moving backwards, and no scientific theories supporting the organized reversal of time. Einstein's theory of relativity predicts time can progress at different rates for different observers, depending upon the differential relativistic speed of the observers, and this difference in the progression time has been confirmed experimentally. But even in those confirmed cases, time always moves forwards for all observers, it just moves forwards faster for some observers than for others.
What happens when the ink in the pen touches the paper?
When ink from a pen touches paper, it is absorbed into the paper fibers due to capillary action. The ink then dries on the paper surface, leaving a permanent mark.
How can an atom of size 1angstrom can absorb a photon of 5000 wavelength?
I presume you asking, "How can an atom of size about 1 angstrom absorb a photon whose wavelength is 5000 angstroms? Wouldn't the photon be too large for that atom?"
The paradox is resolved in this way: the instant you start to discuss electro-magnetic radiation as a photon instead of a transverse electro-magnetic wave, then you negate the wave-length aspect of the light. Instead, you view light as a collection of photons -- particles whose "size" (if that word has meaning) is point-like -- with a specific energy instead of specific wavelength.
A photon is NOT a snake-like wave, vibrating like a rubber band, with a length at least that of its wave-length, as it moves through a medium. A photon is a point particle with a specific energy.
You can describe light as a EM wave with a wave-length OR as a collection of point particles. You can NOT do both at the same time. Light exhibits the characteristics of one OR the other, but NEVER both.
Is there any relationship between light and time?
In special relativity there is a relationship between light and space and time, or more properly light and spacetime. As the speed of light as defined in Maxwell's equations is determined to be a constant regardless of motion of source or observer, spacetime must warp in a certain way (time dialation & space contraction in the direction of observed motion) to maintain meaningful measurements that agree in a sensible way between reference frames having different motion. Using the right relationship, despite changes in measured rate of time and lengths in space between observers in different frames they can all get the same values for intervals between events.
With distances measured in meters and time measured in meters of light travel time, the interval in meters is:
I = √( X2 + Y2 + Z2 - T2 )
When can a body have same distance and same displacement?
Distance is equal to magnitude of displacement
when the motion is in a straight line.
How large the image will be if the object is 25cm tall?
The size of the image will depend on the distance between the object and the lens (or mirror) producing the image. If you provide information about this distance, we can help calculate the size of the image.
What does something being viewed in 4D look like?
In the context of physics and mathematics, viewing something in 4D usually refers to representing a four-dimensional object or concept using mathematical equations or computer graphics. Visualizing this can be challenging since we can only observe three spatial dimensions, but it often involves representing the object in a way that incorporates the fourth dimension (such as time or a concept like hyperspace) through projections or animations.
How much energy did truck 1 lose in the colission help?
That depends on several things. That's why there's a lot of other stuff on the test
or the homework sheet before it says "How much energy ..." etc. You need all that
stuff to answer the question with, and you haven't told us any of it.
Tell us anything you can about these details:
-- What was its energy before the collision ?
-- What's the mass or weight of the truck ?
-- How fast was it going before the collision ?
-- How fast was it going after the collision ?
-- Do you know anything about Truck #2 ?
Is it possible that there is a non-zero acceleration but with a speed of value zero?
Not with any sensible definition of "acceleration" and "velocity."
You CAN accelerate an object and have it end up at zero velocity. But, if the acceleration remains a non-zero number, then the velocity can NOT remain at zero.
Your question is like asking, "Can the value of a quantity change, but also remain the same?"
Is time travel physically possible?
Wormholes are a plausible way to time travel ,but nobody has found out how to make one. But I ,a 13 year old boy, on the other have created an experiment that can make a wormhole that we can use to time travel. If you want to read the experiment plan follow this link...
http://www.ireport.com/docs/DOC-367891#
