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A typical helicopter with four blades rotates at 370 rpm and has a kinetic energy of...

A typical helicopter with four blades rotates at 370 rpm and has a kinetic energy of 5.25 105 J. What is the total moment of inertia, in kg · m2 of the blades?

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Answer #1

1 revolution = 2 radians

1 minute = 60 seconds

Total moment of inertia of the blades = I

Angular speed the blades rotate at = = 370 rpm

Converting the angular speed from rpm to rad/s,

= 38.746 rad/s

Kinetic energy of the blades = E = 5.25 x 105 J

I = 699.4 kg.m2

Total moment of inertia of the blades = 699.4 kg.m2

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