The rolling resistance for steel on steel is quite low; the coefficient of rolling friction is typicallyµ,,= 0.002. suppose a 180,000 kg locomotive is rolling at 10 mis (just over 20 mph) on level rails. if the engineer disengages the engine, how much time will it take the locomotive to coast to a stop? how far will the locomotive move during this time?

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?