A 8,500 kg. railroad car traveling at a velocity of 12m/s strikes a second boxcar at rest. If the two cars stick together and move off with a velocity of 8m/s, what is the mass of the second car

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?