simultaneously drop a coin and a crupled-up piece of paper from the same height. if the effects of air resistance are negligible, both will have the some motion and hit the floor at the same time.?​

The amount of work done is determined by 2 factors. describe an example of work (using the scientific definition) list the 2 factors that determine the amount of work done.

When solid surfaces slide over each other the kind of friction that occurs is called friction

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.)