Aparticle which is moving due east at 4ms 3ms. find the change in velocity. changes direction and starts to move due south at 1. rain falls vertically in still air with a constant velocity of 15ms. if a gale suddenly springs up and the wind blows horizontally at 20ms, calculate the resultant velocity of the rain (magnitude and direction) 2. find the magnitude and direction of a 7n and 24n force perpendicular to each other 3.

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?