Which of the following is evidence that a physical change has occurred? *
a. Broken glass
b. Rust
c. Bubbles
d. Formation of a solid precipitate

In a bumper car arena, two cars of equal mass are heading straight toward each other. the orange one is traveling at a speed of 5 meters per second. the green one is traveling at a speed of 2 meters per second. which of the forces most affects the motion of the bumper cars after they collide? a) gravity b) friction c) the other car d) wind resistance

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

An object's buoyant force and weight mean the same thing. a. trueb. false