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/s) of the centripetal acceleration at the tip of a 4.40 m long helicopter blade that rotates at 345 rev/min. m/s (b) Compare the linear speed of the tip with the speed of sound (taken to be 340 m/s). Vtip/Vsound = Submit Answer -/6.7 Points] DETAILS OSCOLPHYS2016ACC 6.3.P.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) A 23.0 kg child is riding a playground merry-go-round that is rotating at 50.0 rev/min. What centripetal force (in N) must she exert to stay on if she is 2.50 m from its center? (Enter a number.) N (b) What centripetal force (in N) does she need to stay on an amusement park merry-go-round that rotates at 3.00 rev/min if she is 5.00 m from its center? (Enter a number.) N (c) Compare each force with her weight. (For each answer, enter a number.) (force from (a))/(weight) = (force from (b))/(weight) =