What is the difference between an emission and a reflection nebula?
A. Generally, emission nebulas appear blue, and reflection nebulas look red.
B. Emission nebulas contain many dying stars; reflection nebulas are stellar nurseries.
C. Emission nebulas give off their own light; reflection nebulas reflect the light of nearby stars.
D. All of these choices are correct.
Answer: C
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Answer the following statement(s) true (T) or false (F)
The exchange of mediating photons can produce
a. neither a repulsive nor an attractive force. b. either a repulsive or an attractive force. c. a repulsive force. d. an attractive force.
Energy Conservation With Nonconservative Forces: As shown in the figure, a 4.0-kg block is moving at 5.0 m/s along a horizontal frictionless surface toward an ideal spring that is attached to a wall. After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. What is the speed of the block when the spring is compressed to only one-half of the maximum distance?
Fill in the blank(s) with the appropriate word(s).
If a star is found with five planets orbiting it, and a process like that described in the solar nebula theory formed the planets, which of the planets would be expected to have the greatest uncompressed density?
a. The one farthest from the star. b. The one with the greatest mass. c. The one with the greatest radius. d. The one closest to the star. e. The one that has liquid water on its surface.