For an isolated system, the law of conservation of momentum is valid: a. for inelastic collisions. b. for elastic collisions. c. only when there are no collisions. d. for all types of collisions.

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

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?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity