A 1200-kg car moves due north with a speed of 15 m/s. An identical 6. car moves due east with the same speed. What are the direction and the magnitude of the system's total momentum?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Does heating a metal wire increase or decrease its electrical resistance? why?

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