How mush current does a headlight use with a 12 -volt battery if it has a resistance of 3 ohms?

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?

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

How long will it take a car traveling of a constant speed of 45m/s to cover the distance of a 2.5km?