Amodel 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 450 rev/min. a. what is the linear speed of the blade tip? b. what is the radial acceleration of the blade tip expressed as a multiple of the acceleration of gravity?

a)V= 179.056 m/s

b)

Explanation:

Given that

Length of blade = 3.8 m

Rotational speed N= 450 rev/min

We know that

  ω=47.12 rad/s

Linear velocity

We know that linear velocity V =  ω x r

Here r = 3.8 m

So by putting the values

V =  ω x r

V = 47.12  x 3.8 m/s

V= 179.056 m/s

Radial acceleration  

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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not too sure thinking all accelerations are pointed down