The diameters of the main rotor and tail rotor of a singleenginehelicopter are 7.60 m and 1.02 m, respectively. Therespective rotational speeds are 450 rev/min and 4 138 rev/min. Calculate the speeds of the tips of both rotors. Comparethese speeds with the speed of sound, 343 m/s.

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter8: Rotational Motion
Section8.2: Rotational Dynamics
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The diameters of the main rotor and tail rotor of a singleengine
helicopter are 7.60 m and 1.02 m, respectively. The
respective rotational speeds are 450 rev/min and 4 138 rev/
min. Calculate the speeds of the tips of both rotors. Compare
these speeds with the speed of sound, 343 m/s.

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