A ball with a momentum of 16 kg * m/s strikes a ball at rest. What is the total momentum of both balls after the collision?

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Anybody wanna ? (picture included? )

How would a small bar magnet be oriented when placed at position x?