General and Special Relativity

A "hypothesis" changes to a "theory" when empirical evidence backs it up.

Every experiment done over the last 90 years has supported general relativity; not one experiment has challenged it. Indeed, accurate GPS devices would not work unless the effects of general relativity were not factored into their clocks -- so, in effect, every GPS device in the world is an experiment that supports GR.

Contrary to what some people, with a CLEAR and UNDENIABLE motivation to confuse people on what a "theory" means, wrongly claim that a scientific "theory" is something unproven. That is simply not true, but these people will continue to repeat this lie.

-- When forces of unequal magnitude are added, the magnitude of the sum can be

anything between the difference and sum of the individual magnitudes, depending

on the angle between them.

-- When forces of equal magnitude are added, the magnitude of the sum can be

anything between zero and double the individual magnitudes, depending on the

angle between them.

time

yes they did

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No one knows but unless you ask Einstein himself we will never know

anything alive would probably be under the classification of plankton; such as jellyfish, zoeplankton, or phyto plankton. Anything that has never been alive could be anything, such things as wood or plastic bags.

Any object whose density is less than the density of water floats in water.

Time is the measurement of how long a day is, plus it can be shortened and stretched longer depending on the season or if it is day light savings time. Space on the other hand can be either the blackness surrounding our planet the holds billions of stars, where a car parks, or the room a thing takes up. For example how much space does this apartment have? This question was asking how much room or availability to openness does a thing have or contain.

Diffusion refers to the process by which molecules intermingle as a result of their Kineti energy of random motion

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It science.

If the force is aligned with the horizontal, then its vertical component is zero.

That equation is important because teachers ask you weird questions like that in school andy'all need to answer them. If you are wondering this and you are not in school then you probably should not care unless it has to do with work.

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The final temperature of the water will be approximately 30°C when a liter of water at 40°C is poured into a liter of water at 20°C, due to the principle of conservation of energy. The system will reach thermal equilibrium, resulting in a final temperature that is a weighted average of the initial temperatures based on the mass of each component.

In physics, pitch refers to the perceived frequency of a sound wave. It is a subjective quality related to the frequency of the sound wave, with higher frequencies corresponding to higher pitch sounds and lower frequencies corresponding to lower pitch sounds. Pitch is what allows us to distinguish between different musical notes.

A graph which shows how distance(dependent quantity) varies with time(independent quantity). For example, if you want to know how much distance a hare covers in a running race, you plot time along x axis, in seconds(say), and the distance it has traveled along the y axis, in meters(say) , so that by looking at the graph, you know how much distance the hare has traveled from the starting point at any instant of time, or distance between any two given times, and so on!

Of course, I don't see why it features here in the relativity section! Or is it that you are asking what a space-time diagram is?

Please visit the following sites for details explaining the difference between the two: http://archive.ncsa.illinois.edu/Cyberia/NumRel/GenRelativity.html http://archive.ncsa.illinois.edu/Cyberia/NumRel/SpecialRel.html

Most of the impetus for developing general relativity came entirely out of Einstein's thoughts. Einstein needed some time to choose the mathematics necessary to fully develop the theory, and Tulio Levi-Civita assisted him in finding tensor algebra as the best approach.

In a sense, David Hilbert assisted Einstein in that both were working, independently of each other, on finding the equations. This "race," not uncommon in science, inspires both people to do their best work. There is some dispute on who reached the answer first, but Hilbert always stated that Einstein deserved full credit for starting the investigation.

Odd question, why do you ask? Are you hoping to change the past, or predict the future?

If the question is: has everything that will ever happen, already happened? That's (predeterminism), and the answer is simply NO. That would devoid us of any free will (religous speak) or causal effects (more scientific). If our futures are already written, then the egg that breaks tomorrow, has already broken whether I drop it or not, and that just doesn't appear to be true. Cause and effect works in order of A leads to B leads to C = result. I pick up the egg with wet hands, it slips out of my hands, it hits the floor = broken egg. If however all events in history have already taken place, then the egg doesn't need steps A through C to happen...it just breaks, even if I decide to dry my hands before picking it up. Now by all practical accounts, eggs don't just break. History has not been written. Another way to look at it is, if events have already been destined to happen, then "Time" itself is in question, not history. As it stands Time does have a direction, and by all accounts, it has only one, which is forward. Time is an arrow, not a closed loop. So be happy in the knowledge that no matter how bad things get, there may still be a chance that they'll work out in your favour.

Cheers

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If the past and the future have already been written then there would be no choice. Your hands would be wet because you couldn't "decide" to dry them. Some people argue that free will is an illusion. Trouble is that no one can act as though that's true.

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my answer is , yes everything has already happened , and this has no conflict with not having a choice , I still have a choice , I make things happen , but it has already happened by me . confusing ? maybe . I have made my choices , things are going to happen not because there are forced to happen . whatever choice you are going to make does not change it because eventually the choice that are going to make will happen , because it has already happened . hmm looks like a loop.

sometimes I experience dejavu , in one of them i was shocked I felt it clearly that it has happened already and it was going to happen . even next things that i would do , even thinking after dejavu , getting shocked , all happens exactly as i had experienced.

Conventional machines are the machines that are operated manually. They are operated or driven with the help of human resource.

It is the attractive force that all matter possesses for other matter. We're pretty sure of that. We can, thanks to Newton, measure it and describe how it usually behaves. Einstein understood it as an effect of curved space/time, and not as matter dependent.

Thanks to Newton and Einstein, we know enough to think and talk about it, but we still don't completely understand its fundamental nature. We may have to understand the fundamental nature of light before we can understand gravity, since light photons have (we're pretty sure) no mass and yet are affected by gravity (gravitational lensing).

So far it is not possible to make a time machine for a couple of reasons:

1) Human kind have not yet made a machine faster than light and time. If you go faster than the speed of light, you may be able to go backwards in time.

2) If we do travel through time, our molecules in the body will get mixed up and big problems will be caused because of this.

Draw a picture, then save it (save as). Now, change something about your picture (the face, eyes, arms, legs, etc.). Save that as another picture (save as again). Animating is basically many pictures played together to create an illusion of movement. Each picture is called a frame. Now, import your pictures into a video program (like iMovie or Windows Movie Maker). Put them in the order you want them to animate. now select all of those pictures and copy+paste them over and over. That will create an animation loop (your animation played over and over). Have fun animating! Make sure to save your video when you're happy with the length. Animating is a lot easier than it seems!