Q. In a period of 1.0 s, 5.0 x10^23 nitrogen molecules strike a wall of area 7.80 cm2. If the molecules move at 270 m/s and strike wall head on in a perfectly elastic collision, find the pressure exerted on the wall. (The mass of one N2 molecule is 4.68 x10-26 kg.)
Q. A block hangs in equilibrium from a vertical spring. When a second identical block is added, original block sags by 7cm. What is the oscillation frequency of the two-block system?