The ____ regions contain only old stars. The younger ones have ended their lives. And the ____ regions contain both young and old stars and the young, more luminous ones dominate the light.
A.) Red, blue.
B.) Red, red.
C.) Blue, blue.
D.) Blue, red.
Ans: A.) Red, blue.
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Potential of Point-Charges: A 6.9 ?C negative point charge has a positively charged particle in an elliptical orbit about it. If the mass of the positively charged particle is 1.0 ?g and its distance from the point charge varies from 4.0 mm to 16.0 mm, what is the maximum potential difference through which the positive object moves? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 12 MV B. 3.9 MV C. -5.2 MV D. 19 MV
If you were caught in freezing weather with only a candle for warmth, you would be warmer in
A) an igloo. B) a tent. C) a wooden house.
The 3rd harmonic of a complex tone has a frequency of 1,200 Hz. The frequency of the tone is
a. 200 Hz. b. 400 Hz. c. 600 Hz. d. none of the above.
How much force acts on one surface of a rectangular bedroom wall that is 2.20 m by 3.20 m when atmospheric pressure is 1.00 × 105 N/m2?
A) 3.52 × 105 N B) 1.78 × 105 N C) 1.45 × 105 N D) 6.88 × 104 N E) 7.04 × 105 N