Of the Galilean moons, the one with striking grooved terrain and icy tectonic features as well as older craters is:
A) Amalthea.
B) Io.
C) Europa.
D) Ganymede.
E) Callisto.
D
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If each element in this circuit has a resistance of 12 
, what is the resistance of the entire circuit?
The force of gravity is the only one of the four forces felt on large size scales. Which of the following best explains why the other forces don't play a major role on large scales?
A) The strong and weak forces act only on small scales, and large objects tend to be electrically neutral and therefore don't feel an electromagnetic force. B) The other three forces are all short in range, and cannot be felt over large distances. C) Gravity is by far the strongest force, so it simply dominates on large size scales. D) Effects of the strong and weak forces tend to cancel out effects of the electromagnetic force on large scales.
A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two vertical wires which conduct a current I = 8.0 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire?
A. 0.15 N B. 0.68 N C. 0.30 N D. 0.34 N E. 0.10 N
Telescopes designed to study the earliest stages in galactic lives should be optimized for observations in ________
A) infrared light B) visible light C) X-rays D) radio waves