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If we are to expand the exploration of our solar system our

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Intern
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Joined: 15 Aug 2010
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If we are to expand the exploration of our solar system our  [#permalink]

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New post 21 May 2014, 00:25
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A
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E

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Question Stats:

86% (01:08) correct 14% (01:42) wrong based on 241 sessions

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If we are to expand the exploration of our solar system our next manned flight should be to Phobos, one of Mars's moons, rather than to Mars itself. The flight times to each are the same but the Phobos expedition would require less than half the fuel load of a Mars expedition and would, therefore, be much less costly. So, it is clear that Phobos should be our next step in space exploration.

Which one of the following, if true, would most help to explain the difference in fuel requirement?

(A) More equipment would be required to explore Phobos than to explore Mars.
(B) Smaller spaceships require less fuel than larger spaceships.
(C) Information learned during the trip to Phobos can be used during a subsequent trip to Mars.
(D) The shortest distance between Phobos and Mars is less than half the shortest distance between Earth and Mars.
(E) Lift-off for the return trip from Phobos requires much less fuel than that from Mars because of Phobos weaker gravitational pull.

(Aristotle, Critical Reasoning Practice Set - I, Q. 35)
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Re: If we are to expand the exploration of our solar system our  [#permalink]

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New post 21 May 2014, 02:52
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According to the argument:
Fuel load requirement for Phobos expedition = half of fuel load for Mars expedition -> Phobos expedition is less costly -> next manned flight should be to Phobos

Question stem wants us to identify a statement, if true, would strengthen our belief that:
Fuel load requirement for Phobos expedition = half of fuel load for Mars expedition

Lets look at the options:
(A) More equipment would be required to explore Phobos than to explore Mars.
Talks about equipment requirement. Argument focuses on fuel requirement.

(B) Smaller spaceships require less fuel than larger spaceships.
Relates fuel requirement to size of spaceship. We do not know about the size of spaceship that is required for either of the two expeditions.

(C) Information learned during the trip to Phobos can be used during a subsequent trip to Mars.
Talks about usage of information gathered from one expedition for another expedition's purpose. Our focus is to explain the difference in the fuel requirement for the 2 expeditions.

(D) The shortest distance between Phobos and Mars is less than half the shortest distance between Earth and Mars.
Though distance can be related to fuel requirement, here the option talks about distance between (i) Phobos and Mars and (ii) Earth and Mars. We still cant infer the distance between Earth & Phobos and thus cant compare it with distance between Earth & Mars.

(E) Lift-off for the return trip from Phobos requires much less fuel than that from Mars because of Phobos weaker gravitational pull.
Correct answer. Explains that: fuel consumption during lift off from Phobos < fuel consumption during lift off from Mars. Therefore it increase our belief that fuel requirement might be lesser in case of Phobos expedition
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Re: If we are to expand the exploration of our solar system our  [#permalink]

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New post 02 Mar 2017, 02:38
Easy E.

Only E explains the trip would cost less.
Re: If we are to expand the exploration of our solar system our &nbs [#permalink] 02 Mar 2017, 02:38
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