Death Valley in California receives many German tourists. When you convert a summer temperature reading of 130°F to the Celsius scale they use at home, you find that the Celsius temperature is about
A. 26°C.
B. 54°C.
C. 72°C.
D. 176°C
E. 327°C.
Answer: B
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Hypernovae are
a. supernovae that occur when two red dwarfs collide. b. supernovae that occur when 10 solar mass stars explode. c. supernovae that occur when stars more massive than 25 solar masses explode. d. one theory to explain the production of gamma ray bursters. e. both c and d above
A string on a violin is stretched between two points 20.0 cm apart with a tension of 120 N. The mass/length of the string is 0.00200 kg/m. The frequency of the mode of vibration with the lowest frequency is
A. 502 Hz. B. 550 Hz. C. 598 Hz. D. 612 Hz. E. 750 Hz.
A certain chemical reaction has an activation energy of 
What temperature must the reaction be at for the reaction rate to be double the rate at 20
A. 290 K B. 310 K C. 330 K D. 350 K E. 360 K
Based on observations of the universal expansion, the age of the universe is about
A) 14,000 years B) 14 million years C) 14 billion years D) 14 trillion years