General and Special Relativity

A very important role. It forms the basis of the entire theory. What Einstein did, in effect, was assume that inertial and gravitational mass is the same. It was already known at that time that experimentally there was no real difference, but it was sort of regarded as a coincidence; before Einstein there was no real reason why they should be equal.

Einstein looked at what would actually happen if they really are equal, and that assumption (along with the one about the speed of light being constant from his earlier special theory of relativity) directly leads to the equations forming the general theory of relativity.

Looking back one might thus say that both masses are the same because energy warps spacetime.

If someone could show in an experiment that inertial and gravitational masses are not the same it would immediately invalidate Einstein's theory.

interval, which is invariant regardless of frame of reference.

I suppose it does, so one second is the speed of each second, or one minute is the speed of each minute. OR sixty seconds is the speed of each minute. This hopefully will help you:) as much as it confused me by just answering the question:)

PS: What a great question!

So far my view is concerned, I have realized that space and time are only relative to the observer. "Nothing is absolute" is the statement made by Albert Einstein. The very observer is the absolute. So we have to realize our own selves. This is my humble view

because brass is generally tarnish resisant so it does not discolours easily and also because brass is not such expensive as copper

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The pins are make of brass because it is a harder metal than copper and will wear better through use over its lifetime.

Any with a density less than water, or, like a metal ship, an object with a shape which makes its volume greater than the volume of water that it displaces and is sealed so that water will not flow into it.

If you slam on the brakes of your car, a helium-filled balloon will move towards the BACK of the car.

Since helium is lighter than air, a helium-filled balloon will float in air. This is an example of Archimedes Principle. This principle was first described by Archimedes, in the third century BC - the balloon experiences a buoyant force equal to the density of air times the volume of the balloon times the acceleration due to gravity, or

FB = p V g,

This buoyant force is directed OPPOSITE the direction of gravity (UP, whenever gravity is pointed DOWN).

Fast-forward 23 centuries, to 1907, when a young patent clerk named Albert Einstein first described something called the Equivalence Principle. This principle, the foundation of the Theory of General Relativity, states that it is impossible to distinguish between an accelerated reference frame and a gravitation-like force. In English, that means that a car decelerating (like when you slam on the breaks) feels and looks to everyone and everything inside the car as if there is a force of gravity towards the FRONT of the car. Heavy objects (like the driver, the passengers, and any loose objects sitting on the dashboard) act as if they are 'falling' forwards ('falling' in the direction of this 'gravity'). The helium-filled balloon will move towards the BACK of the car, because it will 'float' in the direction OPPOSITE this gravity.

For more detail, visit the Wikipedia or WikiAnswers pages on the Equivalence Principle, Archimedes Principle, and General Relativity.

Because the speed of light is the only constant in the universe, its speed is independent of the reference frame of the observer. It's also because time is not a constant. It takes a bit of thought and openmindedness to get this to stick. Let's take a trip. We'll jump around a bit, so buckle up. Atomic clocks keep time by monitoring the radioactive decay of an unstable nuclide (or radioisotope, if you prefer). If we wind up a pair of them and stick them in a room by themselves for a while to get acquainted and sync up, we can begin an experiment. We take one clock (selected by a coin toss) and put in on an airplane, fly it around for a while, then bring it back. We then stick it back in the room with its twin and compare the times. The clock that went on the trip slowed down and now runs behind the clock that stayed home. The clock that went on the trip had time slow down in its inertial frame. That's because time is not a constant. By any way you try to measure time, it moves more slowly in an accelerated frame. It really does. If you guessed that astronauts who have gone into orbit have had their aging processes slowed down a bit, you'd be right. Not much, but we're all just a bit older (relatively speaking) than those space cadets who return compared to them. This almost sounds like the application circular logic to explain why the speed of light is a constant. But the speed of light really is a constant, and since speed is distance per unit time, and time is not constant, that "allows" light's speed to be constant.

We'll get consequences if the speed of light is not constant. GPS won't work, for just one off the top. GPS has clocks that are "tweaked" to account for the relative velocity of the satellites (which are called "birds") because they're moving around us. A consequence of c not being a constant might be that time is a constant. And GPS wouldn't work because the clocks of the birds are biased to account for their differential velocity. It's not much, but it's real and it's included in the system. And if c was not constant and time was, then the time base on which GPS functions would be "off" and the system would present gross inaccuracies with its readings. Which it doesn't, even with the clocks of the birds keeping different time than what we use here on earth. We always thought of time being a constant, and it took Einstein and his revelations to shake us out of that thinking. We now know that time is not constant, but light speed is. And that means that something else must be not constant. And it is time that is not constant. There is a bit more to this, but what is posted is a sufficient response to answer the question.

Dams must hold back water of a certain depth, determined by the height of the dam. The pressure exerted by this water on the dam is dependent in part by its depth, since the base of the dam must be able to hold pressures exerted by the weight of all the water above the base. Since the pressure is greater at the base, the dam is broader at the base.

i want this answer as early as possible

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DECELERATION,SLOW DOWN=TO REDUCE SPEED,OR MAKE SOMETHING DO THIS

Yes.

Yes.

No! It is a matter of time AND space.

1 Angstrom = .1 nanometer

te science

A stone falls freely from rest The total distance covered by it in the last second of its motion equals the distance covered by it in the first three seconds How long does the stone remain in air?

No.

The moon is far enough from the Earth that its environs are essentially an absolute vacuum. No air means no drag.

Oxygen exists if you are on planet earth in any space that has air. The same amount of oxygen exists in a room with a closed door as in a room with an open door.

If the gun is stationary before the shot, then the momentum of the gun and the

momentum of the bullet are equal and opposite after the shot.

4-cell lithium-ion battery can last 1 - 2 hours in normal use. The total lifetime of battery life is dependent on the type of battery your laptop has, how you use the battery, how it's charge, and how well you take care of the battery.