What spacecraft will visit Pluto in 2015?
a. Cassini
b. Galileo
c. Voyager
d. Voyager 2
e. New Horizons
e
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Adiabatic Processes: A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatically from an initial volume of 120 L to a final volume of 40.0 L. What is the final temperature of the gas?
A. 124 K B. 811 K C. 610 K D. 775 K E. 820 K
Starting from rest, a car accelerates down a straight road with constant acceleration a for a time t, then the direction of the acceleration is reversed, i.e., it is -a, and the car comes to a stop in an additional time t, the time for the whole trip being 2t. At what time, or times, is the average velocity of the car for the trip equal to its instantaneous velocity during the trip?
a. There is no such time. b. It is at the halfway point at t. c. This occurs at 2 times, at 0.5 t and 1.5 t. d. This occurs at 2 times, at 0.707 t and 1.293 t.
Isaac Asimov, noted popularizer of science and science fiction author, has addressed overpopulation: "democracy cannot survive overpopulation. Human dignity cannot survive [overpopulation]. Convenience and decency cannot survive [overpopulation]
As you put more and more people onto the world, the value of life not only declines, it disappears. It doesn't matter if someone dies, the more people there are, the less one person matters." Respond to Asimov's statement by discussing any evidence available.
Why does the electric force dominate at the atomic scale while the gravitational force dominates on the large scale that includes the solar system and beyond?
a. Atoms have no net charge, making electrical forces within atoms negligible. b. There is no gravitational force within atoms, because the law of gravitation applies only to large objects. c. Atomic particles have too little mass for gravitational attraction to compete with electric forces. d. At large distances, individual charges have essentially no effect since, overall, atoms are electrically neutral. e. Both c. and d.