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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, 23:49
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

85% (00:49) correct 15% (01:08) wrong based on 26 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


Attachment:
2017-11-15_1036_003.png
2017-11-15_1036_003.png [ 3.84 KiB | Viewed 565 times ]

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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, 03:41
2pr=25
pr=25/2
r=25/(2*3,14)=25/6,28~4
Answer E
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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, 09:34
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


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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Re: In the figure above, a circular hoop is rolling along a flat surface &nbs [#permalink] 15 Nov 2017, 09:34
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In the figure above, a circular hoop is rolling along a flat surface

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