The gravitational attraction of the sun for earth is _____ that of earth for the sun.
a. greater than
b. the same as
c. smaller than
Ans: b. the same as
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For an astronaut working outside a spaceship, the greatest loss of heat would occur by means of
a. conduction. b. convection. c. radiation. d. conduction and convection. e. conduction and radiation.
What source of energy might keep an ocean beneath the surface of Ganymede liquid?
A) tidal heating only B) radioactive decay only C) tidal heating and radioactive decay D) heat released from its partially molten core
Why is nuclear reactor waste radioactive?
a. Radiation from the reactor makes everything in or near it radioactive. b. Used fuel rods contain fission fragments which are radioactive. c. Spent fuel rods pick up contamination from the reactor. d. all of the above
If the Universe had ________, that would resolve Olbers' paradox.
A. sources of new matter, like white holes B. more mass than electromagnetic radiation C. more electromagnetic radiation than mass D. a finite age E. an infinite extent