A squirrel drops an acorn onto the head of an unsuspecting dog. The acorn falls 4.0 meters before it lands on the dog. We can ignore air resistance. How many seconds did the acorn fall?

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

Which type of wave can travel without a medium

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.