It can be used to determine the masses of many distant objects. :P
Useful is the actual production of electricity. Non-useful -- unused heat energy released into the environment.
I think a pulley is useful because it can help you and other people to.
Some useful inventions are the light bulb, wheel, and the telephone.
Light , which is useful Heat , which is NOT useful.
yes friction is very useful because it help objects not to slide or slip
It can be used to determine a Stars lifetime, its different stages.
The continuous spectrum is extremely important to astronomers. Objects as well as gasses can be located by the direct wavelengths that are presented at any time.
Since the numbers astronomers use are often very large or very small, they frequently use scientific notation to describe sizes and sentences in the universe.
1.9 X 1027 kilograms ------------------------ This is the mass of Jupiter. Try writing that out in longhand and you will see why scientific notation is useful to astronomers. Very large numbers in astronomy need a way to write them in a useful and compact form.
they help us "map out" the sky, and almost like sectioning off places so astronomers can say, "the star we are looking at resides in the Draco constellation" and all the other astronomers can have an understanding of the general area they should be looking at
A Spring is useful in "storing" energy. It is also useful to provide a "measured resistance" to counter-act an opposing force or energy. Or to determine "mass", or gravity expressed as newtons , or plain old lbs or weight. A spring can be useful in many ways. It can reduce shock to components ,vehicles and even bldg's.
The Stonehenge my friend was an Observatory that was said to be used to map stars, or so I have read.
In my opinion, Reshiram is more useful in this version. If you have a Zekrom in the Hoenn region ,however, Zekrom will prove very useful there.
A version tracker is used to track software releases. If one desires to use an older version of a software (for example, when compatibility issues arise), a version tracker is useful.
The cons of using a cheap version of Adobe is that the cheap version does not offer all the extensive abilities that the pro Adobe does. A cheap version might not be as useful as well.
Because it is a large number, suitable for large distances. Astronomers also like to use the unit Parsec.
You can, but it won't be able to do anything useful on >2.9.