The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by mass?
a. 25%
b. 64%
c. 50%
d. 75%
d
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If the Moon had twice as much mass and still orbits Earth at the same distance, ocean bulges on Earth would be
A) smaller. B) larger. C) unequal in size. D) not significantly different. E) none of the above
The magnitude scale
a. originated just after the telescope was invented. b. can be used to indicate the apparent intensity of a celestial object. c. was devised by Galileo. d. is no longer used today. e. was used to determine the rate of precession.
A car moving at a constant speed travels past a valley in the road, as shown below. Which of the arrows shown most closely approximates the direction of the car’s acceleration at the instant it is at the position shown? (Hint: Draw a motion diagram.)
A. A
B. B
C. C
D. D
E. E
F. F
T. T
Interstellar dust grains start the process of condensation in the early solar nebula
Indicate whether the statement is true or false