I love this question. Einstien has a great quote on the answer. There is no such thing as dark or cold or even dumb. dark is the absence of light. cold is the absence of heat and being dumb is the absence of intelligence. there is no speed of dark, but you could probably get away with saying its the same speed as light as dark follows light.
Even the best of us can be wrong. Einstein was a man way before his time back then. But if we fully examine this question and the answers given earlier we can clearly see that we need to elaborate more on this question.
"There is no such thing as dark or cold or even dumb." I beg to differ, The Absence of; simply means you are taking away or have less of. So we can mathematically see that you are moving in the negative direction towards the 0. When light is completely voided we call this point Darkness. Darkness is unlimited or infinite. Light is limited.
"there is no speed of dark," This is Mathematically true. Darkness is everywhere Omnipotent. Light appears where there is a source to illuminate it.
Since darkness is everywhere it does not need to move. Therefore we can summarize that darkness speed is 0. For a better understanding of this concept Zero please read; Zero by Charles Seife
"dark follows light." Darkness neither follows light nor leads it. Light's potential is due to the presents of darkness. When light has exhausted its potential darkness remains. Darkness is everywhere, light is not.
Conclusion:
Darkness concept is liken to the number Zero. All things relating to this number would come under the power of Darkness. When calculating light you must stand at one point and wait for it to reach you. Therefore, light has a origin. I would also like to add that light can be capture or held. Allowing us to measure and work with it. Where as darkness can not. It can only be accepted as we see it. Since we are illuminating creatures depending on light to reach our full potential. We tend to see light as more powerful then darkness and villainized it. Darkness just as light can be beneficial to our everyday needs. With all this said the speed of Darkness would be 0.
Note:
The symbol for darkness is a circle with a line drawn down the middle.
Yes ... in a vacuum.
About 1100 feet per second, which is the speed of sound.
Radio waves travel at the speed of light which, in a vacuum, is about 3 x 108 meters per second.
Your question is very badly worded, as magnetism is a name of several related phenomena. It is like saying "how fast does love travel". That said, I think you are asking how fast do the effects of magnetism travel, and that is the speed of light. For example, if you have a magnetic dipole at the origin with its dipole field everywhere in space (it has sat there stationary for eons), if you rotate it quickly. A point a distance d away, will not sense this based on the magnetic field (indeed, in no way could he sense this), until a time d/c has passed.
Here is another answer I found: How fast does the earth spin? The speed at which the earth spins varies upon your latitudinal location on the planet. If you're standing at the north pole, the speed is almost zero but at the equator, where the circumference of the earth is greatest, the speed is about 1,038 miles per hour (1,670 kph). The mid-latitudes of the U.S. and Europe speed along at 700 to 900 mph (1125 to 1450 kph).
That depends on the speed. After deciding how fast you will travel, divide the distance by the speed to get the time.That depends on the speed. After deciding how fast you will travel, divide the distance by the speed to get the time.That depends on the speed. After deciding how fast you will travel, divide the distance by the speed to get the time.That depends on the speed. After deciding how fast you will travel, divide the distance by the speed to get the time.
Speed
there is no such thing as dark, only the absence of light.
Walking speed.
at the speed of light
Speed of light.
Europa Speed 193,539mph
the speed of light
They travel through space at the same speed that Saturn travels.
At What rate of speed does a text message travel phone to phone
They travel to the speed of light? to it? and where exactly is the speed of light?
186'000 miles an hour or speed of light