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5. [-/6 Points] DETAILS OSCOLPHYS2016ACC 6.2.P.015. MY NOTES PRACTICE ANOTHER 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 4.90 m long helicopter blade that rotates at 265 rev/min. m /s 2 (b) Compare the linear speed of the tip with the speed of sound (taken to be 340 m/s). Vtip sound = 6. [-/13 Points] DETAILS OSCOLPHYS2016ACC 6.3.P.023. MY NOTES PRACTICE ANOTHER (a) A 15.0 kg child is riding a playground merry-go-round that is rotating at 40.0 rev/min. What centripetal force (in N) must she exert to stay on if she is 2.00 m from its center? (Enter a number.) 2 (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 7.00 m from its center? (Enter a number.) 2 (c) Compare each force with her weight. (For each answer, enter a number.) (force from (a))/ (weight) = (force from (b))/(weight)