In Ptolemy's geocentric model, the normal eastward motion of the planets was along
A) a retrograde loop.
B) a deferent.
C) the equant.
D) an epicycle.
E) an ellipse.
B
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During the heavy bombardment early in the solar system's history,
a. giant craters were made on the Moon. b. giant craters were made on Mercury. c. giant craters were made on Earth. d. all of the above.
The circuit below contains three 100-W light bulbs and a capacitor. The emf ? = 110V. At the instant the switch S is closed, which light bulb is brightest?
A. A B. B C. C D. A and B E. All three are equally bright.
When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?
a. 7.2 ? b. 7.6 ? c. 6.9 ? d. 8.0 ? e. 2.8 ?
The orientation of an image seen projected on a screen by a single lens is always __________
Fill in the blank(s) with correct word