SOLUTION: A helicopter blade is 2.75 m long and is rotating at 420 rpm. What is the linear velocity of the tip of the blade?

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Question 295386: A helicopter blade is 2.75 m long and is rotating at 420 rpm. What is the linear velocity of the tip of the blade?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The circumference of the circle traced out by the edge of the blade is given by
C=2%2Api%2AR=2%2Api%2A2.75=5.5%2Api
It travels this circumference 420 times each minute.
V=5.5%2Api%2A420=2310%2Api with units of meters/min.
V=7257 meter/min*(1 min/60 sec)=121 m/s or about 271 mph.