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If a bicycle wheel has a radius of 14 inches. HOw many

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If a bicycle wheel has a radius of 14 inches. HOw many [#permalink] New post 06 Apr 2008, 09:45
If a bicycle wheel has a radius of 14 inches. HOw many revolutions will the wheel make in a mile? ( 1 mile = 5.280 feet)

a) 5.280/28 pi
b) 63.360/ 196 pi
c) 5.280/ 14 pi
d) 15.840/ 7 pi
e) 63.360 / 14
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Re: revolutions [#permalink] New post 06 Apr 2008, 09:54
D.
let's be:
C-circumference of the wheel.
X-#of revolutions
C=2*Pi*r/12=7*Pi /3 (in feet)
X=5280/C=D
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Re: revolutions [#permalink] New post 06 Apr 2008, 11:20
UMB wrote:
D.
let's be:
C-circumference of the wheel.
X-#of revolutions
C=2*Pi*r/12=7*Pi /3 (in feet)
X=5280/C=D


Why do you divide it by 12? Thx
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Re: revolutions [#permalink] New post 06 Apr 2008, 13:21
D for me as well.

Circumference is 7/3*pi feet

in 1 mile then, we go 5.28*(3/7*pi) = 15.84/7 * (pi)
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Re: revolutions [#permalink] New post 12 Apr 2008, 07:35
the circumference is 2*pi*r. why did you guys divide by 12?

I got A.
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Re: revolutions [#permalink] New post 12 Apr 2008, 10:06
Brindusa wrote:
the circumference is 2*pi*r. why did you guys divide by 12?

I got A.


1 feet = 12 inch :-D
Re: revolutions   [#permalink] 12 Apr 2008, 10:06
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