In general, Population I stars are ________ and Population II stars are ________.
A. red; blue
B. dwarfs; massive
C. blue; red
D. massive; dwarfs
Answer: C
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A sound source (normal frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of
A) 2000 Hz. B) 500 Hz. C) 250 Hz. D) 1500 Hz. E) 1414 Hz.
A heat-conducting rod that is wrapped in insulation is constructed with a 0.15-m length of alloy A and a 0.40-m length of alloy B, joined end-to-end
Both pieces have cross-sectional areas of 0.0020 m2. The thermal conductivity of alloy B is known to be 1.8 times as great as that for alloy A. The end of the rod in alloy A is maintained at a temperature of 10°C, and the other end of the rod is maintained at an unknown temperature. When steady state flow has been established, the temperature at the junction of the alloys is measured to be 40° C, and the rate of heat flow in the rod is measured at 56 W. What is the thermal conductivity of alloy A? A) 120 W/m ? K B) 125 W/m ? K C) 130 W/m ? K D) 135 W/m ? K E) 140 W/m ? K
The cost of oil as sold does not include all the concomitant costs, such as those for pollution, the cost of maintaining a defense establishment to protect oil supply, etc
What will be an ideal response?
The most prominent theory about spiral arms is called the _____
A) spiral quantum fluctuations B) spiral gravitational collapse C) spiral density wave theory D) spiral radiation theory