Based on our understanding of our own solar system, which of the following would be most surprising to observe in an extra solar system of planets?
A. Several planets have dense atmospheres containing carbon compounds.
B. The planets nearest to the star have a lower density than the planets farther out.
C. All the gas giants have moons.
D. Several planets show large tilts of their rotation axis compared to the plane of their orbits.
Answer: B
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John rapidly pulls a plunger out of a cylinder. As the plunger moves away, the gas molecules bouncing elastically off the plunger are
a. rebounding at a higher speed than they would have if the plunger weren't removed. b. rebounding at a lower speed than they would have if the plunger weren't removed. c. rebounding at the same speed as they would have if the plunger weren't removed. d. Whether they speed up or slow down depends on how fast the plunger is removed.
When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. How far to my left should I move to obtain destructive interference?
a. one-fourth of a wavelength c. one wavelength b. half a wavelength d. one and a half wavelengths
Parallel-Plate Capacitor: An ideal parallel-plate capacitor having circular plates of diameter D that are a distance d apart stores energy U when it is connected across a fixed potential difference. If you want to triple the amount of energy stored in this capacitor by changing only the size of its plates, the diameter should be changed to
A. 9D.
B. 3D.
C. D
D. 
E. 
Reactance: A 0.10-?F capacitor is connected to a 120-V rms 60-Hz source.(a) What is its capacitive reactance?(b) What is the rms current to the capacitor?(c) If both the capacitance and the frequency were doubled, what would be the rms current?
What will be an ideal response?