3. [-/6 Points] DETAILS SERCP11 7.3.P.009. 0/5 Submissions Used MY NOTES ASK YOUR TEACHER The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.61 m and 1.01 m, respectively. The respective rotational speeds are 452 rev/min and 4,130 rev/min. Calculate the speeds of the tips of both rotors. main rotor m/s tail rotor m/s Compare these speeds with the speed of sound, 343 m/s. main rotor= sound tail rotor = sound Need Help? Read It 4. [-/6 Points] DETAILS SERCP11 7.3.P.016. 0/5 Submissions Used MY NOTES ASK YOUR TEACHER It has been suggested that rotating cylinders about 15.0 mi long and 4.51 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth? rad/s Need Help? Read It