How do you solve this. recklesss randy drives down the road at 48mi/h. looking down to send a text to his gf he takes his eyes off the road for 5.4 sec. what is his speed in ft per sec (1 mile=5280ft) and how far does the cr travel in the time it takes to send a text.

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?