Why are the layers of ice and dust in Mars's permanent ice caps not all the same thickness?
A. Jupiter's gravity affects Mars's climate.
B. Mars's axial tilt has changed over time.
C. Mars's orbital eccentricity has changed over time.
D. All of these choices are correct.
Answer: D
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If the distance between two isolated parallel plates that are oppositely charged is doubled, the electric field between the plates is essentially unchanged. However, the:
a. potential difference between the plates will double. b. charge on each plate will double. c. force on a charged particle halfway between the plates will get twice as small. d. force on a charged particle halfway between the plates will get four times as small.
All the following may be represented by vectors except
a. velocity. b. acceleration. c. speed. d. displacement.
In the context of Jupiter's rings, which of the following happens if a moon comes inside the Roche limit?
A) Raw material for the moon is coalesced. B) Tidal forces overcome the moon's gravity. C) The continuous blast of micrometeorites condenses the ice on the moon's surface. D) Internal heat is generated to break the moon's crust, producing a grooved terrain.
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?