Recent work with type I supernovae at great distances suggests the universe may in fact be accelerating its expansion, a discovery attributed to a newly found
A) repulsive charge on dark matter.
B) polarization and a universal spinning magnetic field.
C) dark energy.
D) magnetic field associated with antimatter.
E) mass determined for the neutrinos.
C
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A whistle produces sound of frequency of 1.00 kHz. If a listener moves with a speed of 30 m/s away from the whistle, what frequency does this person hear if the sound speed is 340 m/s?
A) 912 Hz B) 919 Hz C) 1000 Hz D) 1090 Hz
A steel wire in a piano has a length of 0.700 m and a mass of 4.30 grams. To what tension must this wire be stretched to make the fundamental frequency correspond to middle C, (fc = 261.6 Hz)?
Although the atmospheres of Uranus and Neptune are very similar, the atmosphere of Neptune contains more:
A) Hydrogen. B) Helium. C) Methane. D) Ammonia. E) Nitrogen.
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
A. E. B. F. C. G. D. H. E. A.