Release a ball inside a freely falling elevator and it falls directly in front of you instead of "falling to the floor," because you, ball, elevator, and enclosed air are in free fall. If you do the same with a helium-filled balloon, the balloon
A) also remain in front of you.
B) press against the ceiling.
C) press against the floor.
D) slowly rise.
E) slowly fall.
Answer: A
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The diagram below shows a light curve from a supernova. How many days after maximum light did it take for the supernova to decrease in brightness by a factor of 100?
a.
less than 50
b.
50
c.
150
d.
250
e.
more than 250
Which blurs our Earth-based view of celestial objects?
a. the Sun b. the Moon c. Earth's atmosphere
What keeps the moon moving, i.e., why doesn't the moon slow down and stop?
A) It actually is slowing down, and will come to rest in a few thousand more years. B) Nuclear processes operating in the central core of the moon. C) It is the natural motion of every object to keep moving by itself. D) The sun's gravity keeps it moving. E) Earth's gravity keeps it moving.
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The pressure on A1 in psi is a. 0.25. b. 0.4. c. 4. d. 10. e. 40.