A 1.0 kg ball and a 2.0 kg ball are connected by a 1.1-m-long rigid, massless rod. The rod is rotating cw about its center of mass at 20 rpm. What torque will bring the balls to a halt in 5.6 s? Express your answer in newton-meters to two significant figures. ΜΕ ΑΣΦ T = 1 ? N.m

A 1.0 kg ball and a 2.0 kg ball are connected by a 1.0-m-long rigid, massless rod. The rod is rotating cw about its center of mass at 21 rpm . What torque will bring the balls to a halt in 4.4 s ?

What is the net torque on the square plate with sides 0.2 m from each of the three forces? F=18 N, F2=26 N, and F3=14 N. Use an axis of rotation perpendular to the square and through the center. The axis of rotation passes through the center and perpendicular to the square. F2 30° ion oxis 3.

In a downtown office building, you notice each of the four sections of a rotating door has a mass of 80 kg. What is the width, in meters, of each section of the door if a force of 66 N applied to the outer edge of a section produces an angular acceleration of 0.500 rad/s²? m F

An optical disk drive in your computer is spinning at 10,000 rpm (1045 rad/s).  It decelerates to a rest in 0.42 s.   a. Find the rotational inertia of the disk given that its mass is 17 grams. b. Find the magnitude of the torque required to decelerate the disk.

An old millstone, used for grinding grain in a gristmill, is a solid cylindrical wheel that can rotate about its central axle with negligible friction. The radius of the wheel is 0.330 m. A constant tangential force of 300 N applied to its edge causes the wheel to have an angular acceleration of 0.824 rad/s2. A. What is the moment of inertia of the wheel (in kg · m2)? B. What is the mass (in kg) of the wheel? C. The wheel starts from rest and the tangential force remains constant over a time period of 4.50 s. What is the angular speed (in rad/s) of the wheel at the end of this time period?

A circular bird feeder 19 cm in radius has rotational inertia 0.12 kg∙m2 . It’s suspended by a  thin wire and is spinning slowly at 5.6 rpm. A 140‐g bird lands on the feeder’s rim, coming in  tangent to the rim at 1.1 m/s in a direction opposite the feeder’s rotation. What’s the rotation  rate after the bird lands?

A flywheel of radius R = 0.2 m and mass M = 25 kg is mounted to rotate about its symmetry axis. A rope is wrapped around the wheel and pulled with a force of 10 N. What is the angular acceleration of the wheel? (Assume the wheel is a solid cylinder with I = MR?) F A. 0.2 rad/s? B. 0.3 rad/s? C. 0.4 rad/s? D. 0.5 rad/s? E. 0.6 rad/s?

A circular disk with a radius of 0.38 m is subject to 2 tangentially applied forces. The disc is fixed such that it will rotate about its center. Both forces produce a torque in the same direction. F1 = 3.5 N applied at the outer edge of the disc. F2 = 3.2 N applied at a distance of 0.28 from the center of the disc. What is the net torque on the disc?

A merry-go-round is a common piece of playground equipment. A 5 m diameter (that's diameter) merry-go-round rotates frictionlessly. It has a mass of 166 kg and is spinning at 22 rpm (that's revolutions/minute... you will want to convert to radians/sec). John runs tangent to the merry-go-round at 2.5 m/s in the same direction that it is turning. John's mass is 27 kg. He then jumps onto the MGR and sits halfway between the outer edge and the center.   (A)What is the initial angular momentum, LJ, of John? (B)What is the total initial angular momentum of the system? (C)Use Conservation of Angular Momentum to find the final angular speed of the merry-go-round?