A helium-filled balloon has a volume of 1 m3. As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are ?40°C and 0.1 atm?
A. 4
B. 6
C. 8
D. 10
E. 1.5
Answer: C
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A) Galactic civilizations, like ours, seem forbidden by the laws of physics. B) Interstellar travel is possible yet would take an infinite amount of time because of relativistic time-dilation. C) Reasonable assumptions predict that a galactic civilization should have already arisen in the Milky Way. Yet, we have absolutely no evidence for it. D) The Drake equation predicts that there should be no intelligent life in the Milky Way. Yet, we exist. E) We would be unable to detect an Earth-like planet even at a distance of a few light years.
A 3.0-kg object and a 5.0-kg object hang vertically at the opposite ends of a very light rope that goes over an ideal pulley. If the objects are gently released, what is the resulting acceleration of the objects?
A) 0.00 m/s2 B) 3.7 m/s2 C) 2.5 m/s2 D) 4.9 m/s2 E) 6.1 m/s2
A particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting
A) is brought to a rapid halt. B) decelerates gradually to a halt. C) continues at the same speed it had before encountering the second force. D) theoretically tends to accelerate toward the speed of light. E) none of the above
The Emergency Core Cooling System is used in the event of an accident to ________
a. stop the fission reactions b. reduce fuel rod temperatures c. provide backup power to control rods d. change the decay heat of the fuel pellets