Stars to the lower left of the Hertzsprung-Russell diagram tend to be relatively
A) hot and blue.
B) long lasting.
C) huge and massive.
D) yellow and of average size.
Answer: B
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The source of electrons that illuminate a common lamp in your home is
A) the power company. B) the electrical outlet. C) atoms in the lamp filament. D) the wires leading to the lamp. E) the source voltage.
A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
A. 36 ?V B. 18 ?V C. 31 ?V D. 24 ?V E. 21 ?V
Galaxies are aggregations of stars, stellar dust, and gas. Their masses
A) are all about the same, which is huge. B) vary greatly from one galaxy to the next. C) are small compared to blue supergiant stars. D) depend on the rate of pulsar emissions within them.
In which direction do hurricanes in the Southern Hemisphere rotate?
a. clockwise b. counterclockwise c. either direction