Suppose you want to set up a simple pendulum with a period of 0.250 s
(a) What length is required if g = 9.80 m/s2 on Earth?
(b) What length would be required on the moon assuming g is 6 (assume exact) times LESS than on Earth?
(a) 0.0155 m
(b) 0.259 cm
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Suppose a scientist holds a press conference at which he claims that 10% of the matter in the Milky Way is in the form of dust grains. Does his claim seem reasonable? Why or why not?
A) The 10% figure is too high because there are not enough heavy elements to make that much dust. B) It is reasonable because we already know that interstellar dust obscures our view through the disk of the galaxy. C) The 10% figure is too low because most of the mass of the galaxy is in the form of interstellar dust. D) It seems reasonable as long as we assume that red giant stars, which produce dust grains in their stellar winds, are more common than we thought.
Unlike atoms, molecules can:
A) rotate. B) vibrate. C) spin. D) Both A and B. E) All of the above.
Two uses of ultrasound are navigation by bats and controlling insects
Indicate whether the statement is true or false
The largest volumes of magma extruded on the continents are
A) flood and plateau basalts. B) central-vent type volcanoes. C) batholiths. D) from volcanoes with a high silica content.