Which of the following statements best reflects our current knowledge about the term flife in the equation Number of Civilizations = Np × flife × fcivilization × fnow?
A) The value of flife must be either 0 percent or 100 percent.
B) The value of flife is between 0 percent and 100 percent.
C) The value of flife is between 0 percent and 1 percent.
D) The value of flife is roughly 50 percent.
E) The value of flife is presently unknown but should be well known within just a few years.
B
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Points A [at (2, 3) m] and B [at (5, 7) m] are in a region where the electric field is uniform and given by N/C. What is the potential difference VA?VB?
A. 33 V B. 27 V C. 30 V D. 24 V E. 11 V
The water hole is a radio region with lower background noise
Indicate whether the statement is true or false
A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?
a. It increases. b. It decreases. c. It stays the same. d. In some cases it would decrease, in others it would stay the same. e. In some cases it would increase, in others it would stay the same.
A turbine takes in 2 200-K steam and exhausts the steam at a temperature of 200 K. What is the maximum theoretical efficiency of this system?
a. 83% b. 75% c. 91% d. 68% e. 62%