In the javelin throw at a track-and-field event, the javelin is launched at a speed of 23 m/s at an angle of 34° above the horizontal. as the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. how much time is required for the angle to be reduced from 34° at launch to 16°?

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