The lunar maria are primarily composed of ________.
A. anorthosite
B. olivine
C. silicon dioxide
D. basalt
Answer: D
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A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is
A. 0.25 m/s2. B. 0.125 m/s2. C. 0.5 m/s2. D. 1.0 m/s2.
What do we mean by accretion in the context of planet formation?
A) the formation of moons around planets B) the solidification of ices, rocks, and metal from the gas of the solar nebular C) the growth of the Sun as the density of gas increased in the center of the solar nebula D) the growth of planetesimals from smaller solid particles that collided and stuck together
A student working with a transmitting apparatus like Heinrich Hertz’s wishes to adjust the electrodes to generate electromagnetic waves with a frequency half as large as before. How large should she make the effective capacitance of the pair of electrodes?
1.four times larger than before 2.two times larger than before 3.one-half as large as before 4.one-fourth as large as before 5.none of those answers
Given that our galaxy has a volume of approximately 8 1012 ly3, what would be the average minimum amount of time to exchange messages between civilizations if there are currently 125,000 intelligent civilizations in our galaxy?
A) 800 years B) 1,200 years C) 200 years D) 400 years