Question

Helicopter blades withstand tremendous stresses. In addition to supporting the weight of a helicopter, they are spun at rapid rates and experience large centripetal accelerations, especially at the tip

(a) Calculate the centripetal acceleration at the tip of a 4.00 m long helicopter blade that rotates at 300 rev/min

(b) Calculate the linear speed of the tip.

Answer 1

Find the angular speed in radian per second and then use equation for centripetal acceleration to find a solution as shown below

@ angular speed we 300 rev - 300x2ī min GOS – 31:42 radls So, centripetal acceleration is, a=wer { R = radius of revolution = (31: 42 rams) (4m) = 3.95X108 m/s2 linear speed v = WR = (31:42 vad/s)4m) = 126) ms