University Physics (14th Edition)
14th Edition
ISBN: 9780133969290
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 2, Problem 2.27E
BIO Are We Martians? It has been suggested, and not facetiously, that life might have originated on Mars and been carried to the earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the Martian surface. Astronomers know that many Martian rocks have come to the earth this way. (For instance, search the Internet for “ALH 84001.”) One objection to this idea is that microbes would have had to undergo an enormous lethal acceleration during the impact. Let us investigate how large such an acceleration might be. To escape Mars, rock fragments would have to reach its escape velocity of 5.0 km/s, and that would most likely happen over a distance of about 4.0 m during the meteor impact. (a) What would be the acceleration (in m/s2 and g’s) of such a rock fragment, if the acceleration is constant? (b) How long would this acceleration last? (c) In tests, scientists have found that over 40% of Bacillus subtilis bacteria survived after an acceleration of 450,000g. In light of your answer to part (a), can we rule out the hypothesis that life might have been blasted from Mars to the earth?
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The Lunatik is a military spacecraft on extended patrol in the vicinity of the planet Eqrgp and its moon, with the mission of repelling Vegan invaders who threaten life on Eqrgp or on its moon. The Vegans' home base is on a planet of the star Vega. As it happens, Vegans are vegans, but still very vicious toward non‑Vegan life forms, especially non‑vegan ones. The captain of the Lunatik endangers his craft's vital mission by running out of fuel, leaving the Lunatik adrift in space, subject to the gravitational pulls of Eqrgp and its moon. Ignore the gravitational pulls of other bodies.
The Lunatik's navigator notices that for a short while the craft does not change its speed or direction. How far from the center of Eqrgp is the Lunatik at that time? The distance between the centers of Eqrgp and its moon is 3.03×108 m.3.03×108 m. The mass of Egrqp is 5.39×1024 kg5.39×1024 kg and the mass of its moon is 1.47×1023 kg.
The Lunatik is a military spacecraft on extended patrol in the vicinity of the planet Eqrgp and its moon, with the mission of
repelling Vegan invaders who threaten life on Eqrgp or on its moon. The Vegans' home base is on a planet of the star Vega. As it
happens, Vegans are vegans, but still very vicious toward non-Vegan life forms, especially non-vegan ones. The captain of the
Lunatik endangers his craft's vital mission by running out of fuel, leaving the Lunatik adrift in space, subject to the gravitational
pulls of Eqrgp and its moon. Ignore the gravitational pulls of other bodies.
The Lunatik's navigator notices that for a short while the craft does not change its speed or direction. How far from the center of
Eqrgp is the Lunatik at that time? The distance between the centers of Eqrgp and its moon is 3.91 x 10 m. The mass of Egrqp is
5.03 x 104 kg and the mass of its moon is 1.35 x 10-3 kg.
distance from the center of Eqrgp:
Chapter 2 Solutions
University Physics (14th Edition)
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