Helicopter blades withstand tremendous stresses. In addition tosupporting the weight of a helicopter, they are spun at rapid ratesand experience large centripetal accelerations, especially at thetip. (For each answer, enter a number.)

(a) Calculate the magnitude (inm/s²) of the centripetal acceleration at thetip of a 3.80 m long helicopter blade that rotates at 205rev/min.

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

v_tip/v_sound=