Asked by Sushmitha

What is the tip speed (ft/min) of a 21 inch long rotary lawn mower blade that is connected to the output shaft of an engine operating at 3400 rpm?

What are the steps to figure this out?

Answers

Answered by Steve
a circle of radius 21" has a circumference of 131.95" = 11 ft

so, 11ft * 3400/min = 37400 ft/min
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