1) It is because they produce a lot of pollution in the atmosphere
2) They are limited in number and can't be recycled
Hope this helps!
All machines are not 100% efficient because of <span>C. Friction</span>
Answer:
The set of frequencies of the electromagnetic Waves emitted by the atoms of an element is called emission spectrum.
200 N, that is if the force is balanced and the wall doesn't move
