Question

The rotor blades of a helicopter are 13 ft long and are rotating at 140 rpm.
The angular speed is $280\pi$ rad/min.
What is the linear speed in feet/min?

Answer 1

$\bf \huge \sf\boxed{solution}$

Frequency of the propeller

f = 600 rpm = 60/600

= 10 rps

∴ Angular velocity

w = 2πf = 2π(10)

= 20π rad/s