Two identical rocks are dropped from different heights. The higher one starts out four times as high as the lower one. How much faster is the higher one going just before they hit?

How does momentum change if the mass of an object is doubled?

The law of universal gravitation (gravity) describes two factors that affect the force of gravity between objects. What two factors affect gravity AND how?

When you raise the temperature of air, the molecules move farther apart from each other. This lowers the density of the warm air. What will happen to this warm air? (In an ideal gas, increasing the temperature of the gas also increases its volume.)

What is the energy of an object because of its potential and kinetic energies? A.) chemical energy B.) electrical energy C.) nuclear energy D.) mechanical energy

Explain how faults, mountains, and islands are formed.

Emission of light from an atom occurs when an electron

Which is an example of transfroming potential energy to kinetic

Place the ball in the plastic bag, and twist the top so the ball is secure in the bag. Wrap the twisted portion with tape so it stays tight. Use the hole punch or scissors to poke a hole in the part of the bag that's above the ball.

Choose The units of 1/4πε0 are: A. N2C2 B. N • m/C C. N2 • m2/C2 D. N • m2/C2 E. m2/C2

What does a fern ultimately depend on as an energy source?