Which of the following objects are difficult to model as existing in large enough numbers to significantly explain the effects of "dark matter"?
A. cold white dwarfs
B. planetesimal-sized objects
C. black holes
D. All of these choices are correct.
Answer: D
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Saturn's rings are
a. composed of ice particles. b. in the plane of the planet's equator. c. within the planet's Roche limit. d. composed of ice particles, in the plane of the planet's equator, and are within the planet's Roche limit. e. None of the other choices are correct.
About how far is the Oort cloud from the Sun?
a. 3 to 5 AU b. 45 to 60 AU c. 100 to 1000 AU d. 10,000 to 100,000 AU e. 4.6 billion AU
As its name implies, the ________ star has fused its protons and electrons
Fill in the blank(s) with correct word
A fully charged parallel-plate capacitor remains connected to a battery while you slide a dielectric between the plates. What happens to the value of Q?
1.It increases. 2.It decreases. 3.It stays the same.