An object's motion changes a. only if the object is at rest when a force acts upon it. b. only when a nonzero net force is applied to the object. c. when the forces acting on the object remain balanced. d. all of these

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.