Which of the following quantities has units of a displacement? (There could be more than one correct choice.)
A) 32 ft/s2 vertically downward
B) 40 km southwest
C) 9.8 m/s2
D) -120 m/s
E) 186,000 mi
B, E
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What is the solar wind?
A) a stream of charged particles flowing outward from the surface of the Sun B) the uppermost layer of the Sun, which lies just above the corona C) the strong wind that blows sunspots around on the surface of the Sun D) the wind that causes huge arcs of gas to rise above the Sun's surface
Stars X and Y both have the same apparent brightness, but star X is 10,000 times as luminous as star Y. How much farther away is star X than star Y?
A) Star X is 10 times as far away as star Y. B) Star X is 100 times as far away as star Y. C) Star X is 10,000 times as far away as star Y. D) Star X is 10 times closer to us than star Y.
The newton is a unit of
A) force. B) mass. C) density. D) inertia.
Wave Characteristics: The distance between two asteroids is 1600 km. How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 108 m/s)
A. 19 ms B. 4.5 ms C. 5.3 ms D. 13 ms E. 19 µs