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23 Jul 2017, 23:25
Kudos
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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:
35%
(medium)
Question Stats:
62% (01:12) correct
38%
(01:19)
wrong
based on 45
sessions
History
Date
Time
Result
Not Attempted Yet
A piece of thread is uniformly strung around a right circular cylinder so as to form one complete loop, as shown in the diagram below. What is the length of the thread?
(1) The radius of the cylinder is 2/π.
(2) The height of the cylinder is 3.
2017-07-24_1023.png [ 5.76 KiB | Viewed 2289 times ]
(1) The radius of the cylinder is 2/π.
(2) The height of the cylinder is 3.
Attachment:
2017-07-24_1023.png [ 5.76 KiB | Viewed 2289 times ]
24 Jul 2017, 19:15
Kudos
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Bunuel
It should be C
Statement 1: Insufficient
We do not have any idea of the rise.
Statement 2: Insufficient
We do not have any idea of the radius
Statement 1 + Statement 2:
With this, we can use helical length formula (calculation probably beyond the scope of this) to find out the length of the thread. It basically requires, number of turns, rise in height per turn and diameter of the circle.
Amit989
Joined: 10 Nov 2014
Last visit: 18 May 2022
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Location: India
Schools: ISB'22 (I) Said '22 Cambridge '22 IIMA PGPX'22 (WL)
GMAT 1: 730 Q47 V44
WE:Information Technology (Computer Software)
24 Jul 2017, 20:45
Kudos
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[quote="Bunuel"]A piece of thread is uniformly strung around a right circular cylinder so as to form one complete loop, as shown in the diagram below. What is the length of the thread?
(1) The radius of the cylinder is 2/π.
(2) The height of the cylinder is 3.
Ans:
The question is basically asking you to find the length of the diagonal of the rectanglular surface that will be formed if the cylinder is split open. Imagine a rolled A4 size paper ..released open to form a rectangle.
S-1 Gives u the length - N.S
S-2 Gives u the height - N.S
Together u can calculate the diagonal. Since u have the height and the length of the rectangle.
(1) The radius of the cylinder is 2/π.
(2) The height of the cylinder is 3.
Ans:
The question is basically asking you to find the length of the diagonal of the rectanglular surface that will be formed if the cylinder is split open. Imagine a rolled A4 size paper ..released open to form a rectangle.
S-1 Gives u the length - N.S
S-2 Gives u the height - N.S
Together u can calculate the diagonal. Since u have the height and the length of the rectangle.
