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BIO Are We Martians It has been suggested, and not

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 27E Chapter 2

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 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 450,000 g. 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?

Step-by-Step Solution:

Solution 27E Problem (a) Step 1: Data given Escape velocity of Mars (v) = 5 Km/s or 5000 m/s The distance travelled by the rock fragment when it would be hit by a meteor (S) = 4 m Step 2: To find acceleration of rock fragment (a) Since the acceleration is constant, we may take the equation 2 2 v = u + 2as The rock fragment initially at rest, therefore u = 0 m/s 2 v = 2as Step 3: 2 a = 2s a = 5002 4000 * a = 3125000 m/s (or) a = 318877.55 g (in terms of Earth’s acceleration ) Problem (b)

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Chapter 2, Problem 27E is Solved
Step 5 of 6

Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

Since the solution to 27E from 2 chapter was answered, more than 523 students have viewed the full step-by-step answer. University Physics was written by and is associated to the ISBN: 9780321675460. This full solution covers the following key subjects: acceleration, Mars, Rock, might, EARTH. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. The answer to “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 450,000 g. 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?” is broken down into a number of easy to follow steps, and 198 words. The full step-by-step solution to problem: 27E from chapter: 2 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. This textbook survival guide was created for the textbook: University Physics, edition: 13.

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