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.

1. Calculate the magnitude of the centripetal acceleration at the tip of a 4.00 m long helicopter blade that rotates at 300 rev/min.
2. Compare the linear speed of the tip with the speed of sound (taken to be 340 m/s).

a) $3950 \textrm{ m/s}^2$

b) $37 \%$

Solution Video