Why is Pluto NOT considered a Jovian planet?
A. Its atmosphere is rich in oxygen, making it more like Earth.
B. Its mass and radius are very small, and it lacks the thick atmosphere of hydrogen seen on the other Jovian planets.
C. It is so far out in the Solar System.
D. Its interior is mostly rock and iron.
E. It is not really orbiting the Sun but is simply drifting through the outer edge of the Solar System.
Answer: B
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An observer traveling with speed 0.5c moves directly toward a beacon emitting photons with speed c in her direction. The observer measure the speed approaching photons to be
(a) 0.25c (b) 0.5c (c) c (d) 1.5c
Why does Saturn radiate even more excess heat than Jupiter?
A) Helium rain falling inward generates heat as it descends. B) Saturn's atmosphere contains much methane, which is very flammable. C) Only Saturn is still radiating heat left over from its formation. D) Saturn's thick clouds give it a stronger greenhouse effect. E) Saturn is more massive than Jupiter, so its gravitational compression is stronger.
Consider a point on a bicycle wheel as the wheel makes exactly four complete revolutions about a fixed axis. Compare the linear and angular displacement of the point
a. Both are zero. b. Only the angular displacement is zero. c. Only the linear displacement is zero. d. Neither is zero.
Where and how do deltas form?
What will be an ideal response?