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18 May 2023, 18:31
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
65% (02:17) correct
35%
(02:25)
wrong
based on 636
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The thrust required for a rocket to gain altitude is proportional to its mass, and the ability of a rocket to provide thrust is proportional to the rate at which its engines can convert their fuel to energy. This is why small solid-fuel rockets gain altitude and reach escape velocity much more quickly than do huge combination-fuel vehicles like NASA’s space shuttle, which must labor tremendously to exit the earth’s atmosphere.
The explanation above depends on the validity of which one of the following assumptions?
A. The amount of thrust required to gain altitude is no greater for huge space vehicles than it is for small solid-fuel rockets.
B. Small solid-fuel rockets can move more quickly than huge combination-fuel space vehicles.
C. The ratio of mass to rate of energy conversion is smaller in small solid-fuel vehicles than it is in huge combination-fuel space vehicles.
D. There is relatively little variation in the ability of combination-fuel rockets to provide thrust.
E. The amount of thrust required by a rocket to achieve escape velocity is proportional to the mass of the fuel it carries.
The explanation above depends on the validity of which one of the following assumptions?
A. The amount of thrust required to gain altitude is no greater for huge space vehicles than it is for small solid-fuel rockets.
B. Small solid-fuel rockets can move more quickly than huge combination-fuel space vehicles.
C. The ratio of mass to rate of energy conversion is smaller in small solid-fuel vehicles than it is in huge combination-fuel space vehicles.
D. There is relatively little variation in the ability of combination-fuel rockets to provide thrust.
E. The amount of thrust required by a rocket to achieve escape velocity is proportional to the mass of the fuel it carries.
18 May 2023, 18:32
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Didn't really understand why option C is the correct answer here.
Mukulkumar19
GMAT Focus 1: 705 Q84 V89 DI82 (Online) 
Posts: 50
18 May 2023, 19:22
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Raisakatyal
A. The amount of thrust required to gain altitude is no greater for huge space vehicles than it is for small solid-fuel rockets.
This actually undermines the fact given in the first sentence of the argument
B. Small solid-fuel rockets can move more quickly than huge combination-fuel space vehicles.
Doesnt provide any assumption, as the same is mentioned in the argument.
C. The ratio of mass to rate of energy conversion is smaller in small solid-fuel vehicles than it is in huge combination-fuel space vehicles.
Argument tells us that Mass(M) is proportional to thrust required, means greater the M more the thrust required, also thrust is proportional to Rate of Energy conversion(Re), means greater Re more the thrust. Ok so we know that smaller rockets have less mass and larger rockets have more mass. This answer statement states that M/Re is less for smaller rocket which clearly means that smaller rocket have less M and greater Re in comparison to larger rocket and hence travels faster.
D. There is relatively little variation in the ability of combination-fuel rockets to provide thrust.
Little variation??? in comparison to what
E. The amount of thrust required by a rocket to achieve escape velocity is proportional to the mass of the fuel it carries.
not only mass of fuel but mass of whole rocket
Hope I made some sense.
