Compared to the Sun's convection zone, it is generally hotter in the
A) radiation zone.
B) photosphere.
C) core.
D) All of the above.
Answer: C
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A lunar month is about 28 days. If the Moon were closer to Earth than it now is, the lunar month would be
1) less than 28 days, 2) more than 28 days, 3) still 28 days, mainly because 4) centripetal force would lessen with decreased distance. 5) a closer Moon means an increase in both gravitational force and speed, which in a smaller orbit means shorter time. 6) orbital speed about the center of mass of Earth-Moon system is not dependent upon the distance between Earth and Moon. 7) of tidal friction.
A basketball player can jump 1.6 m off the hardwood floor. With what upward velocity did he leave the floor?
a. 5.8 m/s b. 2.8 m/s c. 5.4 m/s d. 5.6 m/s e. 11 m/s
The fact that a particle cannot be precisely localized is the
a. photoelectric effect b. uncertainty principle c. principle of a hologram d. principle of a laser e. reason why photons are emitted
The force that holds charged atoms together is
A. gravitational force. B. electromagnetic force. C. weak interaction. D. strong nuclear forces.