Compared to the force needed to start sliding a crate across a rough level floor, the force needed to keep it sliding once it is moving is

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.