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Physics

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The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.59 m and 0.98 m, respectively. The respective rotational speeds are 456 rev/min and 4143 rev/min. Calculate the speeds of the tips of both rotors.

main rotor:
tail rotor:

Compare these speeds with the speed of sound, 343 m/s.

  • Physics -

    speedtip= w*r where w=2PI*rev/min*1min/60sec

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