China can benefit from investments in renewable energy sources
What will be an ideal response?
Any country can benefit from investments in renewable energy sources. They
represent the newest technology, and can generally supply energy more cheaply and
responsibly than older technologies.
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Lenses that are thicker at the center than at the edge:
a. converge light. b. diverge light. c. redirect light by 90°. d. refract white light into the color spectrum. e. neither converge nor diverge light.
Entropy: A 700-g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of 330 K. The compression reduces the volume of the gas from 0.40 m3 too 0.15 m3. The molecular mass of the gas is 38.0 g/mol. What is the entropy change for the gas during this compression? (R = 8.31 J/mol ? K)
A. -150 J/K B. -57 J/K C. 150 J/K D. 57 J/K E. 0 J/K
In active galaxies, their central engines may be temporarily fed by
A) a sudden surge of star formation. B) a series of supernovae around the core. C) the sudden collapse of the core into a supermassive black hole. D) a close encounter with a neighbor galaxy. E) the fusion of helium into carbon in their cores.
Which of the following models best explains why our galaxy has spiral arms?
A) No model can explain the existence of the arms, which rotate with the galaxy like the fins of a giant pinwheel toy. B) The spiral arms were imprinted on the galaxy at its birth. Ever since, like a coiling rope, the spiral arms have been wound tighter with each galactic rotation. C) The spiral arms are composed of groups of stars that are bound together by gravity and therefore always stay together as the galaxy rotates. D) The spiral arms are a wave of star formation caused by wave of density propagating outward through the disk of the galaxy.