## Trending News

Promoted

# a helicopter rotor

A helicopter rotor has four blades, each 3.40m long

from the central shaft to the blade tip. The model is rotated

in a wind tunnel at 550 rev/min.

a) What is the linear speed of the blade tip?, in m/s ?

b) What is the radial acceleration of the blade tip

expressed as a multiple of the acceleration of gravity, g?

### 1 Answer

Rating

- 天同Lv 77 years agoFavorite Answer
(a) 550 rev/min = 550 x 2.pi/60 rad/s = 57.6 rad/s

Linear speed of blade tip = 57.6 x 3.4 m/s = 196 m/s

(b) Radial acceleration

= 3.4 x 57.6^2 m/s^2 = 11280 m/s^2

2013-05-28 18:27:13 補充：

(b) when expressed in terms of g,

11280 m/s^2 = 1128g take g = 10 m/s^2

Still have questions? Get your answers by asking now.