How were the rings of Uranus discovered? How have they since been imaged from Earth better?
What will be an ideal response?
Uranus passed in front of a star, and the star's light fluctuated before and after the occultation. These rapid changes were mapped by photoelectric photometry to map the rings. Later observations found them brighter in the infrared, for as the dark material absorbs sunlight, the absorbed energy heats up the rings particles to the point that in the infrared, they are hotter than the planet's surface clouds.
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The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle q above the floor. d. pushed by a force directed at an angle q into the floor. e. turned on its side and pushed by a force parallel to the floor.
Star X has an apparent magnitude of 6, and star Y has an apparent magnitude of 2. How do they compare in observed brightness?
A) Star X appears brighter in the night sky than star Y. B) Star Y appears brighter in the night sky than star X. C) Star X is farther away from us than star Y. D) Star Y is farther away from us than star X.
In expressions like ?v and ?t, ? stands for _________
Fill in the blank(s) with correct word
An object is at rest on the equator. Estimate its speed relative to the center of the Earth in m/s
1.less than 0.001 2.between 0.001 and 0.01 3.between 0.01 and 0.1 4.between 0.1 and 1 5.between 1 and 10 6.between 10 and 100 7.between 100 and 1,000 8.between 1,000 and 10,000 9.more than 10,000 10.Impossible to determine