When a gas in a container expands to twice its volume, its density
A) halves.
B) doubles.
C) quadruples.
D) remains the same.
Answer: A
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Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular velocities of the point
a. Both are constant. c. Only the linear velocity is constant. b. Only the angular velocity is constant. d. Neither is constant.
As you walk away from a plane mirror on a wall, your image
A) gets smaller. B) may or may not get smaller, depending on where the observer is positioned. C) is always a real image, no matter how far you are from the mirror. D) changes from being a virtual image to a real image as you pass the focal point. E) is always the same size.
What is the Big Bang?
A) An enormous explosion that organized all matter in the universe. B) The creation of matter and the universe. C) The creation of the primeval fireball. D) An explosion that spewed matter all over the universe. E) The event that started the expansion of the universe.
Which of the following analogies best describes how the structure of the galaxy's spiral arms is maintained?
A) Like military jets flying in formation above a football stadium, the stars in the spiral arms keep a spiral-shaped formation as they orbit the galaxy. B) Like cars slowing in traffic to look at an accident, stars slow as they pass through the spiral arms. C) Like a coiling rope, the spiral arms wind up tighter with every galactic rotation. D) Like the fins of a giant pinwheel toy, the spiral arms carry a set of bright stars around as they sweep through the galaxy.