Based on its surface features, the most important event on Venus in the past billion years or so was ________
A) the onset of mantle convection, which caused Venus's lithosphere to split into plates like those on Earth
B) a global "repaving" that erased essentially all the surface features that had existed earlier
C) the impact of an unusually large asteroid that left a deep scar on one side of the planet
D) the eruption of a giant volcano that formed one of Venus's "continents"
B
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A comet grows tails (plasma tail and dust tail) when it comes close to the Sun. Which of the following diagrams shows a comet's tails correctly oriented as they appear along its orbit?
When a star moves off the main sequence and becomes a red giant it is brighter because
A. the size of the star increases. B. the star's mass increases. C. the star moves closer to Earth. D. the surface temperature increases.
A galvanometer has an internal resistance of 100 ? and deflects full-scale at a current of 2.00 mA
What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer? A) 50.0 ? in series with the galvanometer B) 50.0 ? in parallel with the galvanometer C) 75.0 ? in parallel with the galvanometer D) 100 ? in series with the galvanometer E) 100 ? in parallel with the galvanometer
The Sun is a
a. moon. b. galaxy. c. planet. d. star.