The system is initially moving with the cable taut, the 14-kg block moving down the rough incline with a speed of 0.070 m/s, and the spring stretched 26 mm. a. Determine the velocity v of the block after it has traveled 128 mm. b. Calculate the distance d traveled by the block before it comes to rest.

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