Why isn't the level of water in aquifer always the same?

Why do most scientists support the collision-ejection theory for the moon's formation?

Convert 45m/s to mph. Choose the best answer to two significant figures. 101mph 45mph 200mph 24mph

The bottom sphere is briefly touched by another conducting sphere of the same size, mounted on an insulating handle. Assuming that the charge of the bottom sphere is q before it is touched by the other sphere, what is its charge after it is touched?

If you are measuring how far a ball traveled in an experiment which example below could be an appropriate measurement? 20 liters 20 grams 20 meters 20 degrees Celsius

Glass is an example of what material?

What are the main activities involved in studying physics?

What is the energy that moves your arms and legs

A moving object can be in equilibrium. Explain.

If gravity puts a force of 3N an object, how much force would it put on an second object that was twice as heavy

Where did the asteroids in the asteroid belt come from?