Football player a has a mass of 210 pounds and is running at a rate of 5.0ml/hr. he collides with player b. player b has a
mass of 190 pounds and is running in the same direction at 3.0 ml/hr. which of the following statements is true?
the momentum before the collision is equal to the momentum after the collision
the momentum before the collision is less than the momentum after the collision
the momentum before the collision is greater than the momentum after the collision

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

What are the 4 phases of matter in order of increasing engery content?