An Earth satellite in an elliptical orbit travels slowest when it is
A) nearest the Earth.
B) farthest from the Earth.
C) neither of these
Answer: B
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Applications to Astronomy: When a distant source emits light of a particular wavelength in the visible, and the source is moving away from us, the color of the light appears to us to be shifted toward the
A. red end of the visible spectrum. B. blue end of the visible spectrum.
The direction of the Moon's revolution around
Earth is a) westward. b) eastward. c) clockwise (looking from above Earth's north pole). d) variable, because the Moon changes its orbital direction as it changes phases.
Which of the following is NOT a true statement about the relationship between the thermal expansion of a solid and the potential energy of an ion in a solid?
What is an accretion disk, and what are its characteristics? Select the true statements regarding accretion disks.
Choose one or more: A. Conservation of angular momentum leads a cloud to form a disk rather than collapse entirely. B. An accretion disk forms because there is nothing to stop the collapse of an interstellar cloud toward its axis of rotation. C. The shape and motion of the accretion disk are the reason that the subsequently formed planets all orbit in or near the equatorial plane of the star. D. Most of the material in an accretion disk that does not end up in the protostar is available to form its planets. E. An accretion disk's radius is typically hundreds of AU.