Question1

A dock worker loading crates on a ship finds that a 22 kg crate, at first at rest on a horizontal surface, requires a 69 N horizontal force to set it in motion. Though, after the crate is in motion, a horizontal force of 46 N is required to keep it moving with constant speed.The acceleration of gravity is 9.8 m/s2. Find out the coefficient of static friction between crate and floor and discover coefficient of kinetic friction.

Question2

A friend of yours is loudly singing a single note at 380Hz while racing toward you at 26.2m/s on a day when speed of sound is 339Hz. What frequency do you listen to? What frequency does your friend hear if you suddenly begin singing at 380Hz?

Question3

An FCC film is deposited on (100) plane of a single-crystal FCC substrate. It is determined that an angle between [100] directions in the film and substrate is 63.4°. What are Miller indices of the plane dishonest in the film surface?