Question

Constants Part A A model of a helicopter rotor has four blades, each of length 3.80 m from the central shaft to the blade tip. The model is rotated in a wind tunnel at a rotational speed of 460 rev/min What is the linear speed of the blade tip? ΑΣ 58.26 m/s Submit Previous Answers Request Answer X Incorrect; Try Again; 6 attempts remaining Part B What is the radial acceleration of the blade tip expressed as a multiple of the acceleration of gravity, g? ΑΣ 9 Submit Request Answer

Answer 1

Solution)

Part a) Angular velocity, w= 460*(2*3.14/60)= 48.14 rad/sec

Length of blade, r=3.8 m

So, linear speed, v=rw = 3.8*48.14= 182.95 =183 m/s

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Part b) Radial acceleration, a=v^2/r = 182.95^2/3.8 = 8808.78=8.8*10^3 m/s (Ans)

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Good luck!:)