A 5-kg object is moving to the right at 4 m/s and collides with another object moving to the left at 5 m/s. The objects collide and stick together. After the collision, the combined object:
a. is moving to the right.
b. is moving to the left.
c. is at rest.
d. has less kinetic energy than the system had before the collision.
D
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If the Moon rises at sunset, then its phase must be
A) third quarter. B) waning gibbous. C) full. D) waxing crescent. E) new.
Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
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Use this exhibit to answer the following question(s).
Refer to . What is the horizontal component of their momentum, in 
What are the three layers of the Sun's atmosphere, in order of increasing distance from the surface?
a. corona, chromosphere, photosphere b. photosphere, corona, chromosphere c. photosphere, chromosphere, corona d. chromosphere, photosphere, corona
Which source is the most luminous (or would be, if all its energy were output in visible light)?
a) The Sun. b) A quasar. c) A nuclear power plant. d) A gamma-ray burst. e) A supernova.