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Please answer what these terms are about(with clear and good explanation)
9.centre of gravity
12.newton's third law of motion
(These term are all about Physics. please anser all of them or i won't give any points to
(You can either use eng. or chi. to answer)
Where are the others?
- 1 decade agoFavorite Answer
In the sky, a meridian is an imaginary great circle on the celestial sphere. It passes through the north point on the horizon, through the celestial pole, up to the zenith, through the south point on the horizon, and through the nadir, and is perpendicular to the local horizon.
Because it is fixed to the local horizon, stars will appear to drift past the local meridian as the earth spins. You can use an object's right ascension and the local sidereal time to determine when it will cross your local meridian, or culminate (see hour angle).
The upper meridian is the half above the horizon, the lower meridian the half below it.
This astronomy related article is a stub. You can help Wikipedia by expanding it
is a chemical element with the symbol Kr and atomic number 36. It is a member of Group 18 and Period 4 elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquified air, and is often used with other rare gases in fluorescent lamps. Krypton is inert for most practical purposes. Krypton can also form clathrates with water when atoms of it are trapped in a lattice of the water molecules.
Krypton, like the other noble gases, can be used in lighting and photography. Krypton light has a large number of spectral lines, and krypton's high light output in plasmas allows it to play an important role in many high-powered gas lasers, which pick out one of the many spectral lines to amplify. There is also a specific krypton fluoride laser. The high power and relative ease of operation of krypton discharge tubes caused (from 1960 to 1983), the official metre (metric distance) to be defined in terms of one orange-red spectral line of krypton-86.
I will send the else to you in the other patchSource(s): www.wikipedIa.org