Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element. a. isotope number b. atomic number. c. atomic mass unit. d. mass number

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?

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?