Adding an organism to a food chain does not affect the other members of the food chain, but removing an organism does.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

Suppose that a cylindrical tank 6 meters high with a radius of 2 meters is filled to the rim with water. the tank is buried so that the top of the tank is 1 meter below ground level. the space above the tank is not filled with water. calculate how much work needs to be done by a pump to pump the water out of the tank up to ground level. (the water weighs 9,800 newtons per cubic meter.)