A ball rolls at a constant 100 feet per minute as it approaches a hill. It then rolls down the hill gaining speed. At the bottom of the hill, it is going at 300 feet per minute. If it took 2 minutes to roll down the hill, then what is the distance from the top of the hill to the bottom of the hill?

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?