You make a solution of salt, water, and sugar. What is the solvent?

How many lenses does a compound microscope have

Suppose Galileo dropped a lead ball (100 kilograms) and a glass ball (1 kilogram) from the leading tower of pisa. Which one hit the ground first?

How does the electric potential energy change as the electron moves from i to f?

If i hold a ball 10 ft. high instead of 3 ft. high, did i lower or raise the ball's potential energy

Any motion that is regular and repeating is referred to as a periodic motion. Most objects that vibrate do so in a regular and repeated fashion much like this spring seen here.

Spiral galaxy rotation curves are generally fairly flat out to large distances. Suppose that spiral galaxies did not contain dark matter.

How are the functions of the cytoskeleton and the cell wall similar

1. How many electrons does the K level of an atom hold?

A puck traveling at 6 m/s in the + x direction hits a wall and bounces back. Right after the collision with the wall it is traveling in the - x direction at 6 m/s.

Sunlight, wind, and running water are essentially "free." Yet renewable energy sources are a very small part of our energy consumption. Why is this?