Aman is dragging a trunk up the loading ramp of a mover’s truck. the ramp has a slope angle of 20.0°, and the man pulls upward with a force f s whose direction makes an angle of 30.0° with the ramp (fig. e4.4). (a) how large a force f s is necessary for the component fx parallel to the ramp to be 90.0 n

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