# physics

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A model of a helicopter rotor has four blades, each 3.40 {m} in length from the central shaft to the tip of the blade. The model is rotated in a wind tunnel at 580 {rev/min}. What is the radial acceleration of the blade tip, expressed as a multiple of the acceleration g due to gravity?

• physics -

I assume you mean that the blades are rotated at that rate, not the model itself.

w = 580*2*pi/60 = 60.7 rad/s

Radial acceleration of tip = R*w^2
= 1.25*10^4 m/s^2

Divide by 9.8 for g's.

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