A2-kg bowling ball is 1 meter off the ground on a post when it falls just before it reaches the ground it is traveling 4.4m/s assuming that there is no air resistance witch statement is true a) the mechanical energy is conserved b) the initial potential energy is less then the final kinetic energy c) the mechanical energy is not conserved d) the initial potential energy is greater then the final kinetic energy

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?