(II) Let us treat a helicopter rotor blade as a long thin rod, as shown in Fig. 8–49. (a) If each of the three rotor helicopter blades is 3.75 m long and has a mass of 135 kg, calculate the moment of inertia of the three rotor blades about the axis of rotation. (b) How much torque must the motor apply to bring the blades from rest up to a speed of 6.0 rev/s in 8.0 s? Rotor FIGURE 8-49 3.75 m- m = 135 kg Problem 43.

(II) Let us treat a helicopter rotor blade as a long thin rod, as shown in Fig. 8–49. (a) If each of the three rotor helicopter blades is 3.75 m long and has a mass of 135 kg, calculate the moment of inertia of the three rotor blades about the axis of rotation. (b) How much torque must the motor apply to bring the blades from rest up to a speed of 6.0 rev/s in 8.0 s? Rotor FIGURE 8-49 3.75 m- m = 135 kg Problem 43.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter10: Fixed-axis Rotation

Section: Chapter Questions

Problem 119AP: An automobile engine can produce 200Nm of torque. Calculate the angular acceleration produced if...

See similar textbooks

Similar questions

If the torque acting on a particle about an axis through a certain origin is zero, what can you say about its angular momentum about that axis?
Can a set of forces have a net force that is zero and a net torque that is not zero?
An automobile engine can produce 200Nm of torque. Calculate the angular acceleration produced if 95.0 of this torque is applied to the drive shaft, axle, and rear wheels of a car, given the following information. The car is suspended so that the wheels can turn freely. Each wheel acts like a 15.0-kg disk that has a 0.180-m radius. The walls of each tire act like a 2.00-kg annular ring that has inside radius of 0.180 m and outside radius of 0.320 m. The tread of each tire acts like a 10.0-kg hoop of radius 0.330 m. The 14.0-kg axle acts like a rod that has a 2.00-cm radius. The 30.0-kg drive shaft acts like a rod that has a 3.20-cm radius.
Repeat Example 10.15 in which the stick is free to have translational motion as well as rotational motion.
Can a set of forces have a net torque that is zero and a net force that is not zero?
Can the diver of Fig. 8–28 do a somersault without havingany initial rotation when she leaves the board? Explain.
A small mass m on a string is rotating without friction in acircle. The string is shortened by pulling it through the axisof rotation without any external torque, Fig. 8–39. Whathappens to the tangential velocity of the object?(a) It increases.(b) It decreases.(c) It remains the same.
Two blocks, each of mass m, are attached to the ends of a massless rod which pivots as shown in Fig. 8–43. Initially the rod is held in the horizontal position and then released. Calculate the magnitude and direction of the net torque on this system when it is first released.
A flywheel of mass 8 tonnes starts from rest, and gets up a speed of 180 r.p.m. in 3 minutes. Find the average torque exerted on it, if the radius of gyration of the flywheel is 60 cm
When the net external torque is zero, angular momentum is conserved. Explain.
Flamingos are frequently seen standing on one leg with the other lifted. Is rotational inertia enhanced with long legs? What can you say about the bird’s center of mass with respect to the foot on which it stands?
Calculate the torque for a force of (3i + 4j) N that acts on a moment arm of (5i + 2j) m.