Skiers in a chairlift are on a 900 meter slope that is inclined at 30 degrees. Assume that for a single rider, it is necessary to lift 70kg of mass to the top of the lift. 12 riders per minute arrive at the top of the lift under maximum load conditions. If half of the energy supplied by the motor goes to overcoming friction, what average power must the motor supply?

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states