A 120-V rms voltage at 60 Hz is applied across a series combination of a 20-?F capacitor and an unknown resistor. If the rms value of the current in the circuit is 0.60 A, what is the resistance of the resistor?
A) 60 ?
B) 120 ?
C) 180 ?
D) 150 ?
E) 200 ?
D
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Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?
A) nuclear fusion and nuclear fission B) nuclear fusion and supernovae C) nuclear fission and supernovae D) nuclear fusion and gravitational contraction
In the H-R diagram, what are the two most important types of data plotted?
A) sizes and temperatures B) luminosities and masses C) absolute and apparent magnitudes D) apparent magnitudes and temperatures E) spectral classes and absolute magnitudes
State the principle of conservation of mechanical energy
What will be an ideal response?
The oldest known fossils are
A) trilobites and brachiopods. B) algae and bacteria. C) fungi and algae. D) worms and jellyfish.