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

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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

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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.

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What is the grating spacing?

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