How are Neptune's rings different from the rings of Uranus?
What will be an ideal response?
The rings of Neptune are bright in forward-scattered light and that indicates the rings contain significant amounts of dust. The narrowness of the rings suggests that shepherd moons must confine them, and a few such moons have been found among the rings.
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If high tide is at noon, the next high tide will be at
A. 6 am B. noon tomorrow. C. midnight. D. 6 pm
Momentum is defined as
A) mass times speed. B) mass times velocity. C) force times velocity. D) mass times acceleration. E) force times acceleration.
What quantities does angular momentum depend upon?
A) mass and velocity B) mass, velocity, and radius C) force and radius D) force, velocity, and radius E) momentum and angular velocity
How have astronomers interpreted the unexpectedly fast rotation of galaxies?
A.) Scientific measurements must be wrong. B.) Galaxies may be breaking up. C.) There must be a lot of dark matter whose gravity can be felt but not seen. D.) These galaxies must have had collisions. E.) B, C, and D.