As a block slides down a frictionless incline, which of the following statements is true?
a. Both its speed and acceleration increase.
b. Its speed increases and its acceleration remains constant.
c. Its speed and acceleration remain constant.
d. Its speed increases and its acceleration decreases. Both its speed and acceleration decrease.
Answer: b. Its speed increases and its acceleration remains constant.
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How much of the night sky is north of the celestial equator?
a. Less than one-half, because of the tilt of the equator to the ecliptic plane. b. More than one-half, because of the precession of the poles. c. Exactly one-half. d. All of the night sky.
Which of the following statements about the celestial equator is true at all latitudes?
A) It extends from your horizon due north, through your zenith, to your horizon due south.
B) It cuts the dome of your local sky exactly in half.
C) It represents an extension of Earth's equator onto the celestial sphere.
D) It lies along the band of light we call the Milky Way.
E) It extends from your horizon due east, through your zenith, to your horizon due west.
In relativity, two people share the same frame of reference only if
A) they are not moving relative to each other. B) they are both located in the same place. C) they are both located in the same place and are traveling at the same speed. D) they are both located in the same place and are stationary. E) they agree on the laws of nature.
Why might it be difficult for Earth-like planets to form around Sun-like stars in the inner parts of the disk of our galaxy?
A) any stars would be sucked into the central supermassive black hole B) there would be insufficient amounts of heavy elements C) the stars would be packed together too densely for planets to be stable D) there would be too much harmful radiation