Pulverized rock is believed to make up the Moon's
a. rays.
b. craters.
c. rills.
d. plains (maria).
a
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Which of the following is true of quasars?
A) Quasar eruptions became less common as galaxies became more stable. B) Quasars did not exist until about five billion years ago. C) Quasars have comparatively smaller look-back time than most galaxies. D) Quasars eruptions were not common when galaxies were actively forming and colliding.
Why is 21-cm radiation so important to the study of interstellar matter and the Galaxy?
A) It helps locate the galactic core in Sagittarius. B) Emitted by hydrogen, it passes through interstellar dust and lets us to map the entire Galaxy. C) Emitted by carbon monoxide, it passes through interstellar gas and lets us to see places rich in organic molecules around the Galaxy. D) It is emitted by most stars, enabling astronomers to map the entire Galaxy. E) It is emitted only in hot regions of star formation, so the pattern of the spiral arms of the Galaxy can be mapped.
The prefix yotta (Y) signifies a multiple of 1024. How many yottameters are there in a gigameter?
What will be an ideal response?
A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0 . The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
a. 0.25 m/s2 b. 0.50 m/s2 c. 0.14 m/s2 d. 0.34 m/s2 e. 0.20 m/s2