Changing the number of which type of subatomic particle makes an atom an isotope?

Explain why the gravitational acceleration of any object near earth is the same matter what was the mass of the object

Assume that both the supply of and the demand for a good are relatively price elastic. The imposition of a per-unit excise tax on the sale of the good would cause the equilibrium price and quantity to change in which of the following ways?

A change in color during a reaction is often a sign that a chemical change has occurred.

What is the ultimate source of energy for all fossil fuels?

A measurement that has both magnitude and direction

What is a controlled experiment? none of the variables are changed all variables are kept constant two variables are changed at a time one variable is changed at a time

At what phase would you expect to find extremely high and low tides?

The Law of Gravitation was mathematically defined by who?

If two cars had the same engine, which delivered the same force to the wheels, but the first car was more massive than the second would the cars perform differently?

The two subspecies ties of astronomy are