Astronomers on Earth are able to measure the rotation of Venus by using optical telescopes to watch surface markings as rotation carries them across the disk of Venus
a. True
b. False
Indicate whether the statement is true or false
False
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Find the work W done by the "ideal" heat engine.
Potential Energy: How much energy is necessary to place three +2.0-µC point charges at the vertices of an equilateral triangle of side 2.0 cm if they started out extremely far away? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 4.5 J B. 5.4 J C. 6.7 J D. 7.6 J
One cat meowing produces a sound intensity level of 55. db
(a) What would be the sound intensity level of 2 cats meowing? (b) ... of 10 cats meowing? (c) ... of 100 cats meowing?
Suppose we make a scale model of our solar system, with the Sun the size of a grapefruit. Which of the following best describes what the planets would look like?
A) The planets are all much smaller than the Sun. Four planets are within about 20 meters of the Sun, while the rest planets are spread much farther apart. B) The planets are all much smaller than the Sun and are spread out evenly over a distance about the length of a large classroom. C) The planets are all much smaller than the Sun. Four planets are located within a few centimeters of the Sun, and four planets are located at distances ranging up to about a meter. D) The planets range in size from about the size of a marble to the size of a baseball. They are spread out over 100 meters.