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A circular wheel travels along a flat surface at a constant

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A circular wheel travels along a flat surface at a constant [#permalink] New post 25 Oct 2008, 10:10
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A circular wheel travels along a flat surface at a constant rate of 2.5 feet per second. How many complete revolutions will the wheel make in 50 seconds if its diameter is 3 feet ?

* 6
* 10
* 13
* 14
* 19
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Re: PS : WHEEL [#permalink] New post 25 Oct 2008, 10:29
amitdgr wrote:
A circular wheel travels along a flat surface at a constant rate of 2.5 feet per second. How many complete revolutions will the wheel make in 50 seconds if its diameter is 3 feet ?

* 6
* 10
* 13
* 14
* 19


13

2.5 fps

circumference = 2 X pi X r = 3.14 X 3 = 9.42 ft

1 sec - 2.5 ft

50 sec - 125 ft

9.42 ft approx 9.5 ft is 1 rev

125 ft - how many revolutions

125/9.5 = 13.4

Completed 13 revolutions and in the 14th revolution.
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Re: PS : WHEEL [#permalink] New post 25 Oct 2008, 13:00
C - 13

Feet in 50 seconds - 2.5*50 = 125
Circumference = 3*pi

Revolutions = 125/(3*pi) ~ 13
Re: PS : WHEEL   [#permalink] 25 Oct 2008, 13:00
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