A third quarter moon is visible
a. near the eastern horizon just before sunrise.
b. near the eastern horizon just after sunset.
c. in the southern sky at sunrise.
d. in the southern sky at sunset.
e. from sunset until sunrise.
C
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A leaf falls from a tree. Compare its kinetic energy K to its potential energy U
A) K increases, and U decreases. B) K decreases, and U increases. C) K decreases, and U decreases. D) K increases, and U increases. E) K and U remain constant.
Virtually all the carbon-rich dust in the plane of the galaxy originated in
A) low-mass stars. B) planetary nebulae. C) high-mass stars. D) brown dwarfs. E) white dwarfs.
A seed is 15 mm in front of a convex lens, and the image of the seed is 4.0 mm behind the lens. What is the focal length of the lens?
A) 11 mm B) 5.5 mm C) 3.8 mm D) 3.2 mm
Neptune's moon Triton
A) rotates in the opposite direction to Neptune's rotation B) orbits in the opposite direction to Neptune's rotation C) orbits about Neptune's rotational axes D) orbits in the same direction to Neptune's rotation