Beyond the formation of iron, nuclear energy can be produced only by
A) fusion of still heavier elements.
B) ionization of the radioactive nuclei.
C) fission of heavy nuclei back toward lighter ones.
D) gravity.
E) the dark force.
C
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What method was used to determine the absolute ages of the lunar rock samples from the Apollo missions?
a. electromagnetic measuring b. radar imaging c. telescopic observations d. microscopic evaluation e. radioactive dating
Gravitational force is greater for a satellite in elliptical orbit when it is at the
A) apogee (farthest point). B) perigee (closest point). C) zenith. D) same acceleration at all of the above places.
The temperature coefficient of resistivity is a quantity that is:
a. always positive. b. always non-negative. c. sometimes negative. d. represented by the symbol ?.
Three cars (car F, car G, and car H) are moving with the same velocity, and slam on the brakes. The most massive car is car F, and the least massive is car H
Assuming all three cars have identical tires, which car travels the longest distance to skid to a stop? A) They all travel the same distance in stopping. B) Car F C) Car G D) Car H