1. Define friction. Name and describe two kinds of friction.

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?

The plum pudding model of the atom states that ?

The slope of a velocity time graph over any interval of time gives the during that interval