Aball is dropped from a building of height h. assume the ball starts from rest and that air friction can be ignored. derive an expression for the amount of time it takes the ball to travel from h to h/2.

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

When electrons are added to the outermost shell of a carbon atom, it forms--an anion that has a larger anion that has a smaller cation that has a larger cation that has a smaller radius.