The universe could be considered an isolated system because
1many people think that no energy or matter exists outside the universe.
2energy and matter are created in the universe and flow freely into and out of the universe.
3 energy is created outside the universe and matter is created within the universe.
4energy is created in the universe and matter is transferred out of the universe.

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p