EP COSMIC PERSPECTIVE-MOD.MASTERING
EP COSMIC PERSPECTIVE-MOD.MASTERING
9th Edition
ISBN: 9780137453481
Author: Bennett
Publisher: SAVVAS L
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Chapter 16, Problem 52EAP
To determine

The volume of molecular cloud.

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The number density of air in a child's balloon is roughly the same as sea level air, 1019 particles/cm3. If the balloon is now 16 cm in diameter, to what diameter (in km) would it need to expand to make the gas inside have the same number density as the ISM, about 1 particle/cm3?
The number density of air in a child's balloon is roughly the same as sea level air, 1019 particles/cm3. If the balloon is now 18 cm in diameter, to what diameter (in km) would it need to expand to make the gas inside have the same number density as the ISM, about 1 particle/cm3?  (Hint: The volume of a sphere is 4/3?R3.)
According to modern science, Earth is about 4.5 billion years old and written human history extends back about 10,000 years. Suppose the entire history of Earth is represented with a 100-meter-long timeline, with the birth of Earth on one end and today at the other end. a. What distance represents 1 billion years? b. How far from the end of the timeline does written human history begin? a. 1 billion years is represented by meters of the timeline. (Type an integer or decimal rounded to the nearest tenth as needed.) millimeters from the end of the timeline. b. Written human history begins about (Type an integer or decimal rounded to the nearest hundredth as needed.)
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