A fan located at a rate of 382 revolutions per minute. The linear speed at the very edge of the fan blade is 18,336 pie inches per minute. What is the length of each fan blade on the fan?

Answer 1

If the fan had radius of 1 inch, then the circumference would be 2pi inches. Spinning at the same rate the linear speed of such fan would be 2pi*382 rev/min = 764pi in/min. So the fan in question is R times bigger.

If it's speed is 18336 pi, divide 18336 pi / 764 pi = 24 inches.