Geologic evidence that supports the theory of continental drift does not include
a. glaciation in the Southern Hemisphere.
b. drag marks on the ocean floor.
c. continuity of geologic structures.
d. the discovery of the same fossils on different continents.
b
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Olber's paradox is explained by the fact that the Universe is neither static nor infinite in age
a. True b. False Indicate whether the statement is true or false
When strong solar winds are displaced poleward by our magnetic fields, we get:
A) the Van Allen radiation belts. B) intense auroral displays. C) sunspots. D) hurricanes in the tropics. E) droughts and dust bowls in the American West.
An ideal spring with a force constant (spring constant) of 15 N/m is initially compressed by 3.0 cm from its uncompressed position. How much work is required to compress the spring an additional 4.0 cm?
A) 0.024 J B) 0.030 J C) 0.012 J D) 0.0068 J
A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
a. -1.3 kJ b. -1.5 kJ c. -1.8 kJ d. -2.0 kJ e. -2.3 kJ