A 14-A current flows into a series combination of a 3.0-? and a 4.0-? resistor. What is the voltage drop across the 4.0-? resistor?
A)
24 V
B)
38 V
C)
42 V
D)
56 V
E)
98 V
D
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When a guitar is tuned to adjust it pitch, what is it that is changed?
A) The wavelength of the fundamental. B) The amplitude of the fundamental. C) The frequency of the fundamental.
Triton has a retrograde orbit around Neptune. This means that ____________
a. Triton orbits in the same direction as Neptune rotates on its axis. b. Triton orbits in the opposite direction to the way Neptune rotates on its axis. c. Triton does not orbit around Neptune. Instead, it stands still.
Kirchhoff's Rules: Determine the current in the 8.0-? resistor for the circuit shown in the figure. Assume that the batteries are ideal and that all numbers are accurate to two significant figures.
A. 0.28 A B. 1.3 A C. 1.6 A D. 2.1 A
According to the argument in the text, the Moon’s average surface temperature (since it has no atmosphere and is the same distance from the sun as the earth) should also be 255 K, or it would be if all points on its surface had the same temperature (and the Moon has the same average reflectance as the earth). But the Moon rotates very slowly relative to the sun (once a month) and has no atmosphere or ocean to redistribute energy differences. How do you think that these facts might affect the Moon’s average temperature?
A. The average should be less than 255 K. B. The average should be more than 255 K. C. The average should be the same: the energy flowing in must still balance the energy flowing out.