4. [-l6.66 Points] DETAILS OSCOLPHYSZO16ACC 6.1.P.001. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Semi-trailer trucks have an odometer on one hub of a trailer wheel. The hub is weighted so that it does not rotate, but it contains gears to count the number of wheel revolutionsit then calculates the distance traveled. If the wheel has a 1.09 m diameter and goes through 230,000 rotations, how many kilometers should the odometer read? (Enter a number.) Em Jr 5. [-16.66 Points] DETAILS OSCOLPHYSZD16ACC 6.2.P.01 5. MY NOTES ASK YOUR TEACHER 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/sz) of the centripetal acceleration at the tip of a 3.80 m long helicopter blade that rotates at 225 rev/min. :1 mi (b) Compare the linear speed of the tip with the speed of sound (taken to be 340 m/s). vnp/vsound = :1 6. [16.7 Points] DETAILS OSCOLPHYSZO16ACC 6.3.P.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) A 19.0 kg child is riding a playground merrygoround that is rotating at 35.0 rev/min. What centripetal force (in N) must she exert to stay on if she is 1.50 m from its center? (Enter a number.) :iN (b) What centripetal force (in N) does she need to stay on an amusement park merrygoround that rotates at 3.00 rev/min if she is 6.00 m from its center? (Enter a number.) :iN (c) Compare each force with her weight. (For each answer, enter a number.) (force from (a))/(weight) = :] (force from (b))/(weight) = :]