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

Does anyone have the answers to online physics course plato course physics, semester a v3.0

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?