Apparent retrograde motion occurs when a planet appears to
A) be stationary with respect to background stars
B) move eastward with respect to background stars
C) move due north with respect to background stars
D) move westward with respect to background stars
D
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The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center. b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion. d. the Copernican system assumed all planets orbited the Sun
Which will warm up quicker in sunlight?
A) a piece of colored glass B) a piece of clear glass C) both the same
The Balmer lines of hydrogen involve electron transitions from the ground state to higher levels
Indicate whether the statement is true or false
An AC circuit consists of a 60-Hz source, a 200-? resistor, and a 1.06-H inductor, all in series. What is the impedance of this circuit?
a. 400 ? b. 280 ? c. 600 ? d. 450 ?