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In the figure above, a circular hoop is rolling along a flat surface

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In the figure above, a circular hoop is rolling along a flat surface [#permalink]

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New post 14 Nov 2017, 22:49
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A
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D
E

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82% (00:46) correct 18% (01:08) wrong based on 22 sessions

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In the figure above, a circular hoop is rolling along a flat surface on a straight line. If point A touches the surface at 25 inch intervals, then the radius of the hoop is approximately

(A) 8 inches
(B) 7 inches
(C) 6 inches
(D) 5 inches
(E) 4 inches


[Reveal] Spoiler:
Attachment:
2017-11-15_1036_003.png
2017-11-15_1036_003.png [ 3.84 KiB | Viewed 350 times ]
[Reveal] Spoiler: OA

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Kudos [?]: 135655 [0], given: 12705

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Joined: 05 Dec 2016
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Kudos [?]: 27 [0], given: 49

Concentration: Strategy, Finance
GMAT 1: 620 Q46 V29
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Re: In the figure above, a circular hoop is rolling along a flat surface [#permalink]

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New post 15 Nov 2017, 02:41
2pr=25
pr=25/2
r=25/(2*3,14)=25/6,28~4
Answer E

Kudos [?]: 27 [0], given: 49

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Joined: 09 Mar 2017
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Kudos [?]: 90 [0], given: 465

Location: India
Concentration: Marketing, Organizational Behavior
WE: Information Technology (Computer Software)
Re: In the figure above, a circular hoop is rolling along a flat surface [#permalink]

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New post 15 Nov 2017, 08:34
Bunuel wrote:
Image
In the figure above, a circular hoop is rolling along a flat surface on a straight line. If point A touches the surface at 25 inch intervals, then the radius of the hoop is approximately

(A) 8 inches
(B) 7 inches
(C) 6 inches
(D) 5 inches
(E) 4 inches


[Reveal] Spoiler:
Attachment:
2017-11-15_1036_003.png

point A makes complete revolutions in 25 inch interval.
Circumference = 2*pi*r = 25
r = 4 inches approx.

E
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Kudos [?]: 90 [0], given: 465

Re: In the figure above, a circular hoop is rolling along a flat surface   [#permalink] 15 Nov 2017, 08:34
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In the figure above, a circular hoop is rolling along a flat surface

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