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# The energy an animal must expend to move uphill is

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Manager
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The energy an animal must expend to move uphill is [#permalink]

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07 Jun 2009, 23:45
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The energy an animal must expend to move uphill is proportional to its body weight, whereas the animal’s energy output available to perform this task is proportional to its surface area. This is the reason that small animals, like squirrel, can run up a tree trunk almost as fast as they can move on level ground, whereas large animals tend to slow down when they are moving uphill.

Which one of the following is an assumption on which the explanation above depends?

(A) The amount of energy needed to move uphill is no greater for large animals that it is for small animals.
(B) Small animals can move more rapidly than large animals can.
(C) The ratio of surface area to body weight is smaller in large animals than it is in small animals.
(D) There is little variation in the ratio of energy output to body weight among animals.
(E) The amount of energy needed to run at a given speed is proportional to the surface area of the running animal.

[Reveal] Spoiler: OA

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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 11:23
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I answered the question using ratio:
let ratio for large animals = S/E
Ratio for small animals = s/e
option C: S/E < s/e.........when inverted looks like this:
E/S > e/s........ that is:
energy expended per unit space (for large animals) > that for small animals...
tallies with the stimulus and is thus the CORRECT answer.
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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 07:30
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I will also go with C for same reason....
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Re: Energy to move uphill [#permalink]

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11 May 2011, 22:59
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let ratio for large animals = S/E
Ratio for small animals = s/e
option C: S/E < s/e.........when inverted looks like this:
E/S > e/s........ that is:
energy expended per unit space (for large animals) > that for small animals...
tallies with the stimulus

thats the kind of representation i was looking for , Got C in
3:00 min
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Re: The energy an animal must expend to move uphill is [#permalink]

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30 Aug 2013, 04:04
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I chose C.
It clearly answers the question: bigger body weight means more energy output is needed to move uhill. Lower surface area means lower energy output. So in combination, this means slower uphill movement.

A is wrong. IMO, it weakens the conclusion. Because if energy amount is the same, then larger animals should be faster due to bigger surface area.
B looks irrelevant to me
D looks again irrelevant since the ratio of energy output to BW is not discussed in the question stem
E provides additional information which does not contribute to the logic of the author.
and it also talks about running while we are interested about moving uphill
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Re: Energy to move uphill [#permalink]

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08 Jun 2009, 00:11
tough question..i think its btwn B and C, leaning towards B
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Re: Energy to move uphill [#permalink]

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08 Jun 2009, 02:20
IMO C

The energy an animal must expend to move uphill is proportional to its body weight, whereas the animal’s energy output available to perform this task is proportional to its surface area. This is the reason that small animals, like squirrel, can run up a tree trunk almost as fast as they can move on level ground, whereas large animals tend to slow down when they are moving uphill.
Which one of the following is an assumption on which the explanation above depends?
(A) The amount of energy needed to move uphill is no greater for large animals that it is for small animals --> counterfact
(B) Small animals can move more rapidly than large animals can --> it's not about the speed of large animals to small animals, it's about speed of each in uphill in compared with each' speed in flat ground
(C) The ratio of surface area to body weight is smaller in large animals than it is in small animals -->the best. Because such ratio of large animals is not equal to that of small animals, large animals can;t remain its speed when moving uphill as can small animals when moving uphill
(D) There is little variation in the ratio of energy output to body weight among animals --> no influence
(E) The amount of energy needed to run at a given speed is proportional to the surface area of the running animal -->not qualified enough to be basis of the argument
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Re: Energy to move uphill [#permalink]

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08 Jun 2009, 03:19
Why B ?

IMO c shud be answer.. as the per logic above..
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Re: Energy to move uphill [#permalink]

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08 Jun 2009, 03:26
I'll go with C.
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Re: Energy to move uphill [#permalink]

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08 Jun 2009, 03:27
I also vote for C.

B is out, since in the argument its mentioned that :
jainu wrote:
This is the reason that small animals, like squirrel, can run up a tree trunk almost as fast as they can move on level ground, whereas large animals tend to slow down when they are moving uphill.

We don't have any comparison of how these animals perform on level ground. The comparison is only for uphill.
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Re: Energy to move uphill [#permalink]

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08 Jun 2009, 09:43
Straightaway C..

Answer can be prephased before even seeing the choices.

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Re: Energy to move uphill [#permalink]

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08 Jun 2009, 14:03
Neochronic wrote:
Why B ?

IMO c shud be answer.. as the per logic above..

Im just skeptical about C because it could be that the surface/body ratio could be bigger on smaller animals. You could assume either way
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Re: Energy to move uphill [#permalink]

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09 Jun 2009, 08:30
Thanks Minheequang . OA is C
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Re: Energy to move uphill [#permalink]

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13 Jun 2009, 23:05
The answer is ofcourse.....But I o see one more flaw in the argument...While talking about the energy required and available, the direction goes to the speed....Which lead me to E initially..Can someone pls explain why E will not be credible...
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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 08:52
it should be C
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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 11:35
IMO C.

@gmatbull,

You must have done good DS
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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 12:27
Guessed C... but really tough one.. mine was a pure lucky guess
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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 14:04
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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 14:06
good question and good explanation by gmatbull
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Re: Energy to move uphill [#permalink]

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27 Apr 2010, 15:14
should be c
Re: Energy to move uphill   [#permalink] 27 Apr 2010, 15:14

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