In a gaseous mixture of hydrogen and oxygen, the molecules having the greater average kinetic energy are
A) hydrogen.
B) oxygen.
C) both the same
D) not enough information
Answer: C
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You are serving the volleyball for the second time in a volleyball game. If the ball leaves your hand with twice the velocity it had on your first serve, its horizontal range R (compared to your first serve) would be
A) twice as much. B) half as much. C) times as much. D) four times as much. E) 2 times as much.
Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
A) The supergiant would appear as large as the full Moon in our sky. B) Earth would fly off into interstellar space. C) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun. D) Earth would be inside the supergiant.
Potential Energy: Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.)
A. Their electric potential energy keeps increasing. B. Their kinetic energy keeps increasing. C. Their electric potential energy keeps decreasing. D. Their kinetic energy keeps decreasing. E. Their acceleration keeps decreasing.
A spinning wheel has an angular momentum that points toward the east. If an eastward force is applied to the edge of the wheel,
A. the angular momentum of the wheel will not change. B. the angular momentum will get larger. C. the angular momentum of the wheel will change direction but not magnitude. D. the angular momentum will get smaller.