All the following statements about Venus are true. Which one offers evidence of a global repaving about a billion years ago?
A) Venus's largest features are three elevated regions that look somewhat like continents.
B) Venus has many circular features, called coronae, which appear to be tectonic in origin.
C) Venus appears to lack any water that could lubricate the flow of rock in its crust and mantle.
D) Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet.
D
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Power: The power rating of a 400-? resistor is 0.25 W. What is the maximum voltage you can safely connect across its ends?
A. 10 V B. 20 V C. 30 V D. 40 V E. 50 V
A(n) ________ spectrum has bright lines on dark background.
A. absorption B. continuous C. emission D. None of these choices are correct.
Why do we think that quasars are extremely distant?
A. They are very bright. B. They are very faint. C. Their light varies rapidly. D. Their spectra show immense redshifts.
In the figure, the current in a solenoid having no appreciable resistance is flowing from b to a and is decreasing at a rate of 9.6 A/s. The self-induced emf in the solenoid is found to be 8.4 V
(a) What is the self-inductance of the solenoid? (b) Which point, a or b is at higher potential? What will be an ideal response?