General and Special Relativity

No, the maximum energy is emitted in the direction of motion of a charge. No energy is emitted in the perpendicular direction. The profile of the drop between these two angles is determined by the velocity (especially whether relativistic or not).

A refrigerator pump with no moving parts so it did not need seals which wearout and then leak.

a stone is thrown from the top of a building with an initial horizontal velocity of 20 m/s if it is thrown from a height of 30 m and air resistance is neglected, find:

a) time it takes the stone to reach the ground

b) range

Conductors don't do the things that those components do. Conductors just

sit there, and whatever goes in, comes out. There's nothing you can do to a

conductor to make it stop conducting, except cut it, and you can only do that

once.

By using the Lorentz transformation instead.

It is measured in Hertz (Hz).

the prism can obtained coloured of light in prism due to disperion of light

Sure. If one finds evidence that a certain statement is not true it will have to changed or removed. That does not mean the statement is no longer useful; it might still form a good approximation to reality.

A good example is Newton's theory of gravity. It turned out to be wrong if masses of objects become big enough. It has been replaced by Einstein's theory of general relativity, but Newton's theory is still used today because it is much easier to work with than Einstein's theory and because it is still a good approximation.

Z means the number of protons in an atom of an element, which is the element's atomic number.

No why would it have to be provided by them?

He hypothesized that the speed of light is constant, no matter what the frame of reference is.

The moon's gravity is roughly 1/6 that of earth, so 36 kilos on earth would weigh approximately 6 kilos on the moon.

When something is evaporating from your skin, it is the more energetic molecules that are escaping. This results in the average energy of the molecules left behind dropping. Temperature is a measure of the average energy of a group of molecules.

The bonds holding rubbing alcohol molecules together are not as great as the bonds holding water molecules together and so the molecules escape more often in the case of water molecules. This increases the cooling effect.

You just have to decide what's more important to you, arrange your priorities

accordingly, and remember that everybody gets the same amount.

In short no. Momentum is always conserved so you always end up with exactly the same amount you started off with.

One subtelty is that momentum is a vector quantity so direction matters. Thus if you have two balls of equal mass moving with the same speed in opposite directions their momenta are equal in magnitude (size) but oppositely directed so the total momemtum is p+(-p)=0 to start with.

A second subtelty emerges when we consider more complicated cases. If there are forces acting on the colliding bodies eg friction then we can 'lose' momentum to these forces (although really we just need to be more careful with the book-keeping).

The theory of relativity is the theory that states that light moves at a certain speed, and nothing can move faster than it. It is physically impossible.

in what follows, please consider sqrt() the square root function, and sqr() the square function (sqr(x) = x * x).

Let's suppose we have a bus, that is travelling at 99.9999999999% of the speed of light (let's call it c, which is more or less 3e8 meters/second)

Let's suppose further that the bus is 3 meters high.

Let's suppose we have a beam of light travelling from the floor of the bus to the ceiling.

If I'm going inside the bus, I'll see the beam reaching the ceiling in some time t.

This time would be t= 3/c.

For an outside observer, s/he would see the same beam performing a diagonal trajectory, rather than a vertical, like me.

From the outside observer's point of view, we have the beam travelling with a speed that has both a vertical and an horizontal component. The horizontal one would equal bus's speed which is (0.999999999999 * c).

But Einnie proved that the beam speed is always constant and always equal to c, both for me and for the outside observer. So, the vertical component of the speed of the beam would be sqrt(sqr(c) - sqr(0.999999999999 * c)), according to Pitagoras Theorem Let's call it cy

As the bus' heigth is 3 meters we have that for the outside observer the time that the beam took to reach the ceiling would be 3 / cy, or

3 / sqrt(sqr(c) - sqr(0.999999999999*c)).

The ratio of the outside observer time to my time will be c / (sqrt(sqr(c) - (sqr(0.999999999999 * c))

if we consider c = 3e8, we'd have this ratio equal (if I computed correctly) to 707106,78118672430109614106527721.

For me, one day in the bus would mean 707106,78 days for the outside observer, or

1935,9528 years. Almost 2 milleniums...

Hope This Helps,

Best,

Oliveiros Cristina

System SW Engineer

Lisbon, Portugal

Time and gravity are related in a way that can be difficult to describe. But gravity affects the "flow" of time, and time in a field of high gravitation moves more slowly than it does outside thatgravimetric field. Even as time dilation is a consequence of movement in an accelerated frame of reference (If you are moving relative to something else, time moves more slowly for you relative to that something else.) Gravity bends spacetime, and that alters time itself as a consequence. Without going into a windy post including free and bound energies, let's do a little "construction" project. We'll use a clear film with a grid on it, and we'll have it stretched in a square frame, but not too tight. The grid is not distorted in any way now, and this film is spacetime. If we gently place a baseball in the middle of the film, it stretches the film and creates a "dent" or "well" in the film. The stretched area of the film around the gravity well created by the ball can be seen as the lines of the grid no longer maintaining their "even" spacing. The grid has been warped because the plastic film has. Our spacetime has been warped by the mass of the ball, and time is not the same near that ball. It moves more slowly near or in a gravity well. Added: It's important to note that subjective time is always the same. Your second and my second will seem to be the same regardless of the frame of reference in which we experience it. But when our clocks are compared, the clock at the bottom of a gravity well will be seen to have counted its intervals more slowly in comparison with an identical clock outside the gravitational field. Time is not altered, but exchanged. At the bottom of a gravity well, my time will include some of your space, and outside of the gravity well, vice versa.

Probably the "gas" between galaxies. Its density is estimated to be on the order of less than ten protons per cubic meter -- about 100,000 times less dense than the best vacuum ever created on Earth.

what is the important of its study for architects? explain with examples the relation bewtween architecture environment and ecology?

Relative motion. To talk about a train moving at a certain speed usually means that the train is moving at a certain speed relative to a stationary observer (relative to the ground). This however also means that a passenger traveling in said train would experience the ground (and every other stationary object) as the moving object. This is why a stationary train may seem to be moving to passengers of an already moving train.

Acceleration and motion work in a vacuum the same way as they do here -- except for the air (and other) resistance and the gravity of the earth. Let's look at a pair of examples and check things out. We can gain leverage through gravity and friction here on earth. We can bowl. If you try to bowl in space, you'll be moving away from the ball as it is moving away from you. The ball would be doing most of the moving, but you would be doing some. If you hit a table tennis ball here on earth, it slows down dramatically as it moves across the table and past the net. In space, it would not slow down at all due to the aerodynamic forces of air on it like here. Your "kill shot" would rocket away and not slow down.

Same as "run for office". Announce your desire for the office,

and attempt to persuade voters to elect you.

Disregarding friction, the net force on a car during circular motion is equal to the product of its mass and the square of its velocity, divided by the distance from the center of the circle to the car (the radius). This is also equivalent to the car's centripetal acceleration.