Which of these are units of measure?
a. time
b. energy
c. seconds
d. kilometers
e. volume
c, d
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The percentage (by number of atoms) of the Sun that is Hydrogen is about:
A) 91%. B) 71%. C) 27%. D) 9%. E) less than 1%.
Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
A) Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. B) Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. C) Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month. D) Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.
The circuit below contains three 100-W light bulbs and a capacitor. The emf ? = 110V. At the instant the switch S is closed, which light bulb is brightest?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.
At about what fraction of the speed of light do today's spacecraft travel?
A) 1/10 B) 1/100 C) 1/10,000 D) 1/1,000 E) 1/2