A Kelvin thermometer and a Fahrenheit thermometer both give the same reading for a certain sample. The corresponding Celsius temperature is:
A. 574? C
B. 232? C
C. 301? C
D. 614? C
E. 276? C
Answer: C. 301? C
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The best explanation for the activity at the center of the galaxy is a(n) ____
a. supercluster of O and B stars b. black hole with a mass several thousand times the Sun's c. giant atomic hydrogen cloud energized into a single, massive emission nebula d. black hole with a mass several million times the Sun's e. exotic object known as a "magnetar"
Air with a density of 1.20 
flows through a 10.0 cm diameter pipe with a velocity of 1.20 m/s. What is the mass flow rate?
A. 0.0148 kg/s B. 0.0131 kg/s C. 0.0120 kg/s D. 0.0113 kg/s E. 0.0098 kg/s
The tilt of Earth's axis greatly affects the
A) change of Earth's seasons. B) hours of daylight. C) intensity of sunlight that reaches Earth's surface. D) distribution of heat energy, hours of daylight, and the change in seasons.
Briefly describe what you would see if your friend plunged into a black hole. Assume you are watching from orbit of the black hole and have a telescope powerful enough so that you can see him clearly as he falls.
What will be an ideal response?