Colors seen on some TV screens result from color
A) addition.
B) subtraction.
C) either of these
D) neither of these
Answer: A
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One difference between Population I and Population II stars in the Milky Way is
A. that Pop I stars produce energy by fusion and Pop II stars through gravitational contraction. B. that Pop I stars produce energy by fusion and Pop II by fission. C. that Pop I stars have orbits in the disk and Pop II stars have orbits that pass through the disk. D. that Pop I stars have very few metals and Pop II stars are metal rich.
An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m2. What is the capacitance of this capacitor with air between these plates? (?0 = 8.85 × 10-12 C2/N ? m2 )
A) 89 pF B) 8.9 pF C) 0.89 pF D) 8.9 µF E) 8.9 nF
An AC power generator produces 42.9 A (rms) at 2 970 V. The voltage is stepped up to 6 000 V by an ideal transformer, and the energy transmitted through a long-distance power line with a total resistance of 100 ?. What is the rms current in the long-distance line?
a. 87 A b. 21.2 A c. 42.9 A d. 30.2 A e. 61.0 A
An alpha particle is another name for a(n) __________
Fill in the blank(s) with correct word