A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the lunar month would be
A) more than 28 days.
B) unchanged at 28 days.
C) less than 28 days.
Answer: C
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What kind of a gas cloud can collapse and form stars?
A.) A very hot gas cloud that has a huge internal pressure can collapse and form stars. B.) A gas cloud that has a mass less than 10 solar masses can collapse and form stars. C.) The gas cloud must have a mass that exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud. D.) The gas cloud must have a mass that is smaller than the Jeans mass so that gravity overcomes the internal pressure in the cloud. E.) A black hole can collapse and form stars.
Unlike electric charges, magnetic poles cannot be
A) located. B) isolated. C) destroyed.
What capacitance is needed in series with a 30 
resistor at 1.0 kHz for a total impedance of 45 
?
A. 34 
F
B. 15
F
C. 4.7F
D. 0.037F
When U.S. annual energy use and gross national product (GNP) are graphed, the two graphs rise at the same rate until the mid-east oil shocks of the 1970s, after which
A) GNP keeps rising while energy use levels off due to global warming. B) GNP keeps rising while energy use begins to level off due to increased energy efficiency. C) energy use decreases due to declining fossil fuel supplies. D) GNP levels off while energy use keeps rising due to technological stagnation. E) total energy use increases without a similar increase in GNP, because of increased oil imports.