The old surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters.
b. appear dark in color with many impact craters.
c. appear very bright because ice is very reflective.
d. generally show long bright grooves and a modest number of impact craters.
e. generally have small volcanoes that are active.
b
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Two charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters, the force on each charge will be
A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) 16 N.
If the AA numerical designation of an alloy is followed by “T7”, the alloy is solution heat-treated and artificially _________.
Fill in the blank(s) with the appropriate word(s).
The astrometric method seeks to detect planets by
A) precisely measuring distances to stars. B) directly detecting the light of planets orbiting stars. C) measuring small changes in the positions of stars on the sky. D) precisely measuring the velocities of stars moving toward and away from us. E) measuring small changes in the apparent brightness of stars.
Strictly speaking, if a beam of white light is shone through a piece of very thick glass, the first color to emerge from the other side is
1) white. 2) violet. 3) red. 4) green. This is because 5) all frequencies travel at c. 6) lower frequencies undergo more refraction in a medium. 7) higher frequencies of light travel at a faster average speed through a medium. 8) higher frequencies of light interact with more molecules in a medium.