System whose domain is not in time can be a time invariant system.
Ex: taking photo to a fixed object.
here domain is not in time so photo wont change with time
Useless is a non-example of practical.
Oh yes, the metric system is extremely practical.
the first practical radio signal system is Jan Hendrix Campos
A practical example is it's the reason the sky is blue.
example report practical training in business administration
example of practical application/technologies using Einstein's Theory
water expansion is an example
It is practical. It is based on 100 so all the numbers fit in nicely with the western world's 10 base number system.
Francium hasn't practical uses.
horse power
Fight Club
One example of sound wave absorption in a practical setting is the use of acoustic panels in recording studios to reduce echoes and improve sound quality.