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The energy an animal must expend to move uphill is

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Re: Energy to move uphill [#permalink] New post 27 Apr 2010, 23:41
Hi,

Option 'E' does not speak anything regarding "body weight" which does not cover the entire criteria. Hence, it is incorrect and the best option is 'C' as suggested.

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Re: Energy to move uphill [#permalink] New post 28 Apr 2010, 03:29
The answer is C.

1) The argument above says that the energy an animal must expend to move uphill is proportional to its body weight and the animal’s energy output available to perform this task is proportional to its surface area.
2) Small animals can run up fast and the large animals slow down when moving up.

The second statement can only be true if we assume that the energy output of large animals is less than what is required and the energy output of small animals is more than what is required. From 1) it implies that surface area to body weight ratio is smaller in large animals than it is in small animals..

Hence option C.
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Re: Energy to move uphill [#permalink] New post 29 Apr 2010, 04:24
Though a little timetaking due to cautiosness, C is the inly option which consideres thefact that Surface area plays no role in large animals
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Re: Energy to move uphill [#permalink] New post 06 Sep 2010, 06:12
C.
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Re: Energy to move uphill [#permalink] New post 06 Sep 2010, 09:48
Good one but if you read closely it is easy to figure out
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Re: Energy to move uphill [#permalink] New post 29 Apr 2011, 04:44
The answer is C.
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Re: Energy to move uphill [#permalink] New post 29 Apr 2011, 05:09
"C" for sure!!
Explanations are provided next to the answer choices!!
jainu wrote:
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.It is contradicting the argument,which clearly states that the energy needed is directly proportional to the body weight!!
(B) Small animals can move more rapidly than large animals can.One can not assume that small animals are more agile than the large ones for the information given in the argument says only about uphill movement!e.a. leopard might be quicker than squirrel on flat surface but he might not be quicker than squirrel in uphill movement!!
(C) The ratio of surface area to body weight is smaller in large animals than it is in small animals.This is the best choice as the amount of energy available for use is directly proportional to the body's surface area & amount of energy expended is directly proportion to the body weight. thus S.A./B.W. must be more to move quickly (uphill)
(D) There is little variation in the ratio of energy output to body weight among animals.By this logic all the animals should move uphill at almost same speed.
(E) The amount of energy needed to run at a given speed is proportional to the surface area of the running animal.One of the premises mentioned in the argument.

Please provide the reasoning.

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Re: Energy to move uphill [#permalink] New post 29 Apr 2011, 12:33
It's C.
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Re: Energy to move uphill [#permalink] New post 29 Apr 2011, 22:56
Clear C.
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Re: Energy to move uphill [#permalink] New post 30 Apr 2011, 01:42
tough one....guess its c
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Re: Energy to move uphill [#permalink] New post 01 May 2011, 08:01
c
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Re: Energy to move uphill [#permalink] New post 01 May 2011, 11:55
C
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Re: Energy to move uphill [#permalink] New post 01 May 2011, 22:21
why Not E please explain.
conclusion is regarding speed and evidance are about energy.
So missing link or assumption should be the one which relates the two.
Please explain anyone.
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Re: Energy to move uphill [#permalink] New post 09 May 2011, 18:09
C
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Re: Energy to move uphill [#permalink] New post 10 May 2011, 09:46
"E" is one of the premises mentioned in the argument.

Se my post above!
vdbhamare wrote:
why Not E please explain.
conclusion is regarding speed and evidance are about energy.
So missing link or assumption should be the one which relates the two.
Please explain anyone.

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Re: Energy to move uphill [#permalink] New post 11 May 2011, 21:59
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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: Energy to move uphill [#permalink] New post 16 Sep 2011, 05:30
Very tough one.. Took 3 minutes.. C it is..
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Re: Energy to move uphill [#permalink] New post 16 Sep 2011, 13:35
I picked C....2:09 mins
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Re: Energy to move uphill [#permalink] New post 18 Sep 2011, 01:24
C
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Re: Energy to move uphill [#permalink] New post 21 Sep 2011, 00:16
IMO C. I used POE and came to C.

jainu wrote:
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.

Please provide the reasoning.

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Re: Energy to move uphill   [#permalink] 21 Sep 2011, 00:16
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