Which of the following is not due to tidal forces?
A) the synchronous rotation of the Moon around Earth
B) the volcanos on Io (a moon of Jupiter)
C) the rings of Saturn
D) the grooved terrain of Enceladus (a moon of Saturn)
E) the backward orbit of Triton (a moon of Neptune)
E
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Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that
A. any two rubber rods charged this way have opposite charges on them. B. any two glass rods charged this way have opposite charges on them. C. a rubber rod and a glass rod charged this way have opposite charges on them. D. all rubber rods always have an excess of positive charge on them. E. all glass rods always have an excess of negative charge on them.
The circuit below contains 5 identical light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
a.
A: The one closest to the positive terminal of the battery.
b.
A and C: The bulbs closest to the positive terminal of the battery.
c.
A and B: Because they are closest to the terminals of the battery.
d.
C and D: Because they receive current from A and B and from E.
e.
E: Because the potential difference across E is that of the battery.
What information does a star's Greek-letter designation convey?
What will be an ideal response?
A blackbody's emission as observed through a low-density gas will produce a ____________________ spectrum
Fill in the blank(s) with correct word