A 120-m long copper wire (resistivity 1.68 × 10-8 ??m) has resistance 6.0 ?. What is the diameter of the wire?
A)
0.065 mm
B)
0.65 mm
C)
0.65 cm
D)
0.65 m
E)
6.5 m
B
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Which of the following is the most convincing observation that suggests that like Europa, Ganymede may also have a subsurface ocean?
A) the detection of salts on the surface that may have been brought up from below the crust B) the presence of young grooved terrain that may be the result of cryovolcanism C) the fact that it is the largest moon in the solar system and, hence, should have plenty of internal heat to maintain liquid water beneath its surface D) in addition to its internal magnetic field, Ganymede has a magnetic field induced by Jupiter which is consistent with a salty ocean beneath its crust
All but the most inactive metals react with acids to give
a. hydrogen and the metal salt. b. hydrogen and the metal hydroxide. c. hydrogen and the metal oxide. d. oxygen and the metal hydride.
What is the source of the energy the Sun radiates to us?
A) chemical reactions B) nuclear fission reactions C) nuclear fusion reactions D) magnetic explosions E) cosmic rays
A standing wave is set up on a string so that it has 5 nodes. If you start at the central node and move exactly one wavelength in either direction, you will wind up at
A. neither a node nor an antinode but still on the string. B. an antinode. C. a node. D. somewhere off the string.