In a hockey game two defencemen simultaneously hit an opposing forward, who has a mass of 80 kg. one defenceman exerts a force on the forward of 475 n, 25° w of n. the other defenceman exerts a force on the forward of 40 n, 60° e of n. determine the net force acting on the forward and the forward’s acceleration.

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