A laser can be used for very accurate measurements of distances between objects
Indicate whether the statement is true or false
T
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If ice crystals fall from clouds through an underlying air layer that is below freezing, which of the following forms of precipitation would result?
What will be an ideal response?
An amount of work equal to 3.0 J is required to compress the spring in a spring-gun. What is the "launch speed" of a 15 g marble?
a. 14 m/s c. 18 m/s b. 15 m/s d. 20 m/s
Tycho's universe was the same as the Copernican universe except that
a. Earth did not move. b. the Sun did not move. c. the Moon orbited the Sun. d. the orbits were elliptical with the Sun at one focus. e. the orbits followed uniform circular motion.
Stars X and Y both have the same apparent brightness, but star X is 10,000 times as luminous as star Y. How much farther away is star X than star Y?
A) Star X is 10 times as far away as star Y. B) Star X is 100 times as far away as star Y. C) Star X is 10,000 times as far away as star Y. D) Star X is 10 times closer to us than star Y.