A wave has a period of 4 seconds. What is its frequency?

What do stars begin as

A certain copper wire has a resistance of 10.5 ω. at what fraction of the length l must the wire be cut so that the resistance of one piece is 9.0 times the resistance of the other?

What does the term "energy crisis" mean?

Electromagnets in radios can be used to A) play a CD. B) create sound. C) change the station. D) make a remote control.

Why are large astronomical bodies such as planets and stars round

In a nuclear reaction, what is the name for the difference in mass when one type of matter is converted into another? A. radiation B. nucleons C. antimatter D. mass defect

Aspect of the physical world

What does scientific theory mean

IS IT right to the left a b c d

You accidentally slide a glass of milk off a table that is 0.9 m tall. How long does it take the milk to hit the ground.