Planet x rotates in the same manner as the earth, around an axis through its north and south poles, and is perfectly spherical. an astronaut who weights 943.0n on the earth weights 915.0n at the north pole of planet x and 850.0n at its equator. the distance from the north pole to the equator is 18,850 km., measured along the surface of planet x.

(a) how long is the day on planet x?
(b) if a 45, 000kg satellite is placed in a circular orbit 2000km above the surface of planet x, what will be its orbital period.

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?