What do astronomers infer from the motion of the distant galaxies?
A. The Universe is static.
B. The Universe is spinning.
C. The Universe is contracting.
D. The Universe is expanding.
E. None of these choices is correct.
Answer: D
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If you stand on a weighing scale and suddenly the atmosphere vanishes, taking buoyancy into account, the scale reading
A) increases. B) decreases. C) remains the same. D) quickly reduces to zero.
The safest way to view an image of the Sun is to use
A) a telescope. B) binoculars. C) a pinhole. D) colored sunglasses.
An objective lens of a telescope has a 1.90 m focal length. When viewed through this telescope, the moon appears 5.25 times larger than normal. How far apart are the objective lens and the eyepiece when this instrument is focused on the moon?
What will be an ideal response?
On an axis in which moving from right to left is positive, what is the displacement and distance of a student who walks 32 m to the right and then 17 m to the left?
a. Displacement is -15 m and distance is -49 m. b. Displacement is -15 m and distance is 49 m. c. Displacement is 15 m and distance is -49 m. d. Displacement is 15 m and distance is 49 m