Homework Help: physics

Posted by Kelly on Tuesday, May 22, 2012 at 10:03pm.

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 - drwls, Wednesday, May 23, 2012 at 1:54am
I assume you mean that the blades are rotated at that rate, not the model itself.

blade angular velocity:
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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