Lunar eclipses can occur only when the phase of the Moon is
A) new.
B) first quarter.
C) full.
D) third quarter.
C) full.
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What does "maria" mean?
a. plateaus b. ponds c. rivers d. rivers e. seas
When a nucleus undergoes alpha decay, the daughter element always has
A. more electrons than the parent. B. less charge than the parent. C. more neutrons than the parent. D. the same atomic number as the parent.
An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 340 m/s, is
A) 0.1 s. B) 1 s. C) 10 s. D) 20 s. E) more than 20 s.
A fisherman fishing from a pier observes that the float on his line bobs up and down, taking 2.4 s to move from its highest point to its lowest point. He also estimates that the distance between adjacent wave crests is 48 m
What is the speed of the waves going past the pier? A) 1.0 m/s B) 20 m/s C) 10 m/s D) 5.0 m/s E) 120 m/s