The total impedance Z of an RLC circuit driven by an AC voltage source at angular frequency ? is
A.
.B.
.C.
.D.
.E.
.Answer: B
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What happens to the rotation of a molecular cloud as it collapses to form a star?
A) The rotation rate remains the same at all times. B) The rotation slows as the cloud collapses. C) The rotation rate increases as the cloud collapses.
When we look at an object that is 1,000 light-years away, we see it ________
A) as it was 1,000 light-years ago B) looking just the same as our ancestors would have seen it 1,000 years ago C) as it is right now, but it appears 1,000 times dimmer D) as it was 1,000 years ago
The hydrogen and helium in our solar system were created from subatomic particles about ____________ years ago
a. 14 billion b. 10.5 billion c. 7.0 billion d. 4.5 billion
The planet's orbital period is
A) the time it takes it to rotate and have the same face toward us again. B) the time it takes to return to the same location in the sky, relative to the Sun. C) the time it takes for a satellite to orbit it. D) the time it takes for it to retrograde back to the same position as we pass it. E) the time its magnetic field takes to spin once.