The circumference of an 8-inch diameter wheel = d*pi = 8*pi. Each revolution will advance the wheel by one circumference, so 2000 revolutions per minute would be 2000 * 8 * pi = 1600pi feet per minute.
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The diameter, or the distance across the circle. So if my diameter was 8, I'd take eight times 3.14 and get... give me a minute... 25.12! (That was done using pencil/notecard) Or, you can find the diameter by dividing the Circumference by Pi.
Eight.
25.13 meters
It depends on the diameter of the straw, which varies. Multiply the diameter by 3.14 and the result by the length of the straw.
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