Magnetic reversals of the Earth's field have occurred on the average every 200,000 years over the past 5 million years. When was the last magnetic reversal?
a. about 200,000 years ago
c. about 990,000 years ago
b. 1792
d. about 780,000 years ago
Question 2
If one could transport a simple pendulum of constant length from the Earth's surface to the Moon's, where the acceleration due to gravity is one-sixth (1/6) that on the Earth, by what factor would the pendulum frequency be changed?
a. about 6.0
c. about 0.41
b. about 2.5
d. about 0.17
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