About what percentage of the mass of a molecular cloud is in the form of dust?
A) 1%
B) 10%
C) 50%
D) 98%
A
Physics & Space Science
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Cosmetologists are the astronomers and physicists who do research in cosmology
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Work-Energy Theorem: A certain car traveling at 34.0 mph skids to a stop in 29 meters from the point where the brakes were applied. In approximately what distance would the car have stopped had it been going 105.4 mph?
A. 279 m B. 158 m C. 90 m D. 51 m E. 29 m
Physics & Space Science
Suppose you have a rock that, when it solidifies, contains 1 microgram of a radioactive isotope. How much of this isotope remains after five half-lives?
a. 1/32 microgram b. none c. 1/16 microgram d. 1/8 microgram e. Cannot be determined without knowing the daughter isotope.
Physics & Space Science
What is the grating spacing?
Physics & Space Science