The full moon by definition occurs
a. for only a day.
b. for 7-3/8 days.
c. only for an instant.
d. only once every month.
c
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Europa has few craters because
a. it is protected from impacts by Jupiter's gravity. b. it does not have a solid surface. c. it has erased craters nearly as fast as they have formed. d. its surface is not strong enough to support craters. e. it keeps one face always pointed toward Jupiter which screens it from incoming meteorites.
Which of these are English units?
a. seconds b. feet c. kilometers d. slugs
The amount of current in an incandescent bulb rated 75W 120V is about
A) 0.4 A. B) 0.6 A. C) 1.2 A. D) more than 1.2 A.
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the disintegration constant (in s-1)?
a. 5.6 × 10^-2 b. 5.6 × 10^8 c. 3.2 × 10^7 d. 1.8 × 10^-9 e. 1.6 × 10^6