Van Allen Belts exist in Earth's ________.
A. troposphere
B. core
C. magnetosphere
D. mantle
Answer: C
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Which of these lamps is the longer lasting in a common circuit?
A) incandescent lamp B) compact fluorescent lamp C) light-emitting diode D) all about the same
In the context of the unified model of active galactic nuclei (AGN), you see jets of gas and radiation emerging perpendicular to the accretion disk of an AGN and coming straight at you if:
A) the accretion disk is tilted at an angle of 30 degrees to your line of sight. B) you look directly into the central cavity around the black hole. C) you view the accretion disk from its edge. D) the accretion disk is tilted at an angle of 60 degrees to your line of sight.
Interference: Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum constructive interference is to occur at point P, the two beams must travel paths that differ by
A. a whole number of wavelengths. B. an odd number of half-wavelengths. C. a whole number of half-wavelengths.
Which of the following frames would be an appropriate inertial reference frame for analyzing the effects on the earth of its gravitational interaction with the moon? In each case, answer A if the frame is appropriate, or B if it would be bad for this purpose. Except for the first case, assume the frames are nonrotating.
(a) A frame attached to the earth’s surface (b) A frame attached to the earth’s center of mass (CM) (c) A frame attached to the earth–moon system’s CM (d) A frame attached to the sun’s CM (e) A frame attached to the entire solar system’s CM