What does the presence of vesicular basalts and breccias among the lunar rock samples tell us about the history of the Moon?
What will be an ideal response?
Vesicular basalts are made when lava flows out onto the surface. The presence of vesicular basalts shows that much of the surface of Earth's Moon has been covered by successive lava flows, and the dark flat plains of the lunar lowlands, the maria, are actually solidified ancient lava. Breccias are made up of fragments of broken rock cemented together under pressure. The breccias show how extensively the lunar surface has been pounded by meteorites.
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Observations indicate that over billions of years, galaxies in general tend to change from
A) smaller and bluer to larger and redder. B) larger and redder to smaller and bluer. C) smaller and redder to larger and bluer. D) larger and bluer to smaller and redder.
A star's luminosity is the
A) total amount of energy that the star radiates each second. B) total amount of energy that the star will radiate over its entire lifetime. C) surface temperature of the star. D) lifetime of the star. E) apparent brightness of the star in our sky.
Water flows over a 2-m-wide flat plate with the same velocities as in Problem 4 in the mini-exam for Section 4.4 where we found v = 0.0667 m/s. The frictional force F acting on the horizontal surface is nearest:
(A) 1300 N
(B) 1500 N
(C) 1700 N
(D) 1900 N
You have two tuning forks that have a beat frequency of 2 Hz with respect to each other. One of them has a frequency of 440 Hz, but you do not know the frequency of the other. You place a small piece of clay on the other, an amount just capable of changing the beat frequency by 1 Hz, and you repeat the experiment. This time the beat frequency is 3 Hz. From this information, what is the frequency
of the other tuning fork (when it has no clay on it)? 1.442 Hz. 2.443 Hz. 3.438 Hz. 4.437 Hz.