(c) The oxygen molecules will, on average, be moving more rapidly than the helium atoms.

(b) Both will be moving at the same speed.

(d) The kinetic energy of helium atoms will exceed that of oxygen molecules.

(a) The helium atoms will be moving faster than the oxygen molecules, on average.

(e) None of the above.

(e) 1.4 times greater in B.

(d) twice as great in B.

(c) 1.4 times greater in A.

(b) twice as great in A.

(a) the same in both gases.

(b) the number of molecules in the container.

(d) the mass of the molecules.

(c) the temperature of the gas.

(a) the size of the container.

(b) The pressure must increase.

(c) The pressure must increase while the volume decreases.

(e) The pressure, the volume, or both, may increase.

(d) The volume must increase while the pressure decreases.

(a) The pressure must decrease.

(d) The object will slow down, momentarily stopping, then pick up speed moving to the left.

(b) The object cannot have a negative acceleration and be moving to the right.

(c) The object will continue to move to the right, slowing down but never coming to a complete stop.

(a) The object will slow down, eventually coming to a complete stop.

(d) Not enough information.

(b) Equal to 40 km/h.

(a) More than 40 km/h.

(c) Less than 40 km/h.

(e) The accelerations are in opposite directions.

(c) The acceleration of both balls is the same.

(a) The acceleration of the dropped ball is greater.

(b) The acceleration of the ball thrown upward is greater.

(d) The acceleration changes during the motion, so you cannot predict the exact value when the two balls pass each other.

(b) v = 0, a = 9.8 m/s^2 up.

(e) v = 9.8 m/s down, a = 0.

(c) v = 0, a = 9.8 m/s^2 down.

(d) v = 9.8 m/s up, a = 0.

(a) v = 0, a = 0.

(c) The velocity of the second rock increases faster than the velocity of the first.

(d) Both velocities stay constant.

(a) Both increase at the same rate.

(b) The velocity of the first rock increases faster than the velocity of the second.

(a) –x direction at a constant 20 m/s.

(b) –x direction increasing in speed.

(d) –x direction decreasing in speed.

(c) +x direction increasing in speed.

(e) +x direction decreasing in speed.