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. (For each answer, enter a number.)

(a) Calculate the magnitude (in m/s²) of the centripetal acceleration at the tip of a 4.40 m long helicopter blade that rotates at 325 rev/min.

(b) Compare the linear speed of the tip with the speed of sound (taken to be 340 m/s).v_tip/v_sound =