You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?
a. about a mile b. half a mile
c. a tenth of a mile d. none of the above
c
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Three solid, uniform, cylindrical flywheels, each of mass 65.0 kg and radius 1.47 m rotate independently around a common axis. Two of the flywheels rotate in one direction at 3.83 rad/s; the other rotates in the opposite direction at 3.42 rad/s
Calculate the magnitude of the net angular momentum of the system. A) 298 kg • m2/s B) 778 kg • m2/s C) 257 kg • m2/s D) 222 kg • m2/s
Kepler made a major break from ancient beliefs when he
A) decided to look for a system that could explain actual observations B) realized that gravity holds the planets in their orbits C) abandoned circular orbits in favor of elliptical orbits
We know how fast a distant galaxy is moving away from us on the basis of its
A) mass. B) color. C) spectrum. D) age. E) luminosity.
The percentage of electricity from nuclear power generated in recent decades in the United States has been about
A) 10%. B) 20%. C) 30%. D) 40%. E) more than 40%