A model of a helicopter rotor has four blades, each 3.4 m in length from the central shaft to the tip of the blade. The model is rotated in a wind tunnel at 550 rev/min. What is the linear speed of the tip of the blade?

Explanation:

v = ωr

v = (550 rev/min) (2π rad/rev) (1 min / 60 s) (3.4 m)

v = 196 m/s

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