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A typical helicopter has four blades that rotate at 313 rpm and have a total kinetic...

A typical helicopter has four blades that rotate at 313 rpm and have a total kinetic energy of 4.20 * 10^5 J. What is the magnitude of the total angular momentum of the blades about the axis of rotation?

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Answer #1

The total kinetic energy of the helicopter blades is given by

The angular velocity of the blades is

Putting it in the equation above

The angular momentum is given by

So, the answer is 2.56 x 104 kg.m2/s.

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