A mass on a spring with a constant of 50 N/m is stretched 0.10 meters from its rest position. What is the potential energy stored in the spring-mass system and what is the maximum kinetic energy and velocity of the mass?

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You can decrease the resistance of a length of wire by

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?