Which of the following is true of spring tides?
A) They occur at noon and midnight every day.
B) They occur at first- and third-quarter moons.
C) They occur at dawn and dusk every day.
D) They occur at new moon and full moon.
D
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Any object moving relative to Earth will have a Doppler shift
Indicate whether the statement is true or false
An electron which moves with a speed of 7.5 × 10^3 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 × 10^-19 C)
a. 1.9 × 10^-15 N c. 2.2 × 10^-24 N b. zero d. 4.8 × 10^-14 N
Current observations indicate that the amount of baryonic matter and dark matter in the Universe
a. is sufficient great enough to overcome the expansion of the Universe. b. implies that the Universe is closed. c. is mostly in the form of black holes and quasars. d. are roughly equal. e. implies that the Universe is open.
Most of the world's sand is composed of the minerals
A) feldspar and quartz. B) silicon and oxygen. C) quartz and muscovite. D) silicon and aluminum.