17. Under what condition(s) is the angular momentum of a rotating body, such as a spinning ice skater, conserved? (a) Each external force acting on the body must be zero. (b) Each external force and each exter- nal torque acting on the body must be zero. (c) Each external force may be nonzero, but the sum of the forces must be zero. (d) Each external torque may be nonzero, but the sum of the torques must be zero.

17. Under what condition(s) is the angular momentum of a rotating body, such as a spinning ice skater, conserved? (a) Each external force acting on the body must be zero. (b) Each external force and each exter- nal torque acting on the body must be zero. (c) Each external force may be nonzero, but the sum of the forces must be zero. (d) Each external torque may be nonzero, but the sum of the torques must be zero.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

At the presentation ceremony, a championship bowler is presented a 1.44-kg trophy which he holds at arm's length, a distance of 0.655 m from his shoulder joint. (a) Determine the torque (in N - m) the trophy exerts about the shoulder joint when his arm is horizontal. (Enter the magnitude only.) |N•m (b) Determine the torque (in N · m) the trophy exerts about the shoulder joint when his arm is at an angle of 37.0° below the horizontal. (Enter the magnitude only.) N. m
A basketball hits the outer rim of the hoop with a force of 2.5 lb at an angle of 75∘ from the horizontal before going in. The distance between the outer rim of the hoop and the backboard (point A) is 18 in. What is the moment/Torque created at the backboard (moment/Torque about A due to force of basketball) in units of in lb?
O Rësources Lx Give Up? Hint The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius r = 0.262 m and mass 4.32 kg, and two thin crossed rods of mass 8.66 kg each.A farmer would like to replace his wheels with uniform disks ta = 0.0588 m thick, made out of a material with a density of 8290 kg per cubic meter. If the new wheel is to have the same moment of inertia about its center as the old wheel about its center, what should the radius of the disk be? ra = about us privacy policy contact us help careers terms of use
. A person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation (a) increases (b) decreases (d) doubles. (c) remains unchanged
a) What constant torque needs to be applied to a wheel with rotational inertia I=0.1kg-m² about its central axis to decrease crease its angular velocity from 26 to 16 rad/s in 5s? Assume constant angular acceleration. Calculate b) initial and c) final angular momentum of the flywheel, d) angular acceleration of the flywheel. Hint: angular momentum of a rigid body is L= Io, solve part d) first.
Mutiple choice: The torque is rotational counterpart of force, but it is not force. It has tendency of rotating objects. The torque is more effective when, (1) force is larger (2) force is far from axis of rotation (3) angle between r and the force is zero a) Only (1) is correct b) Only (2) is correct c) All (1), (2), and (3) are correct d) Both (1) and (2) are correct
"The edge of the disk has a constant tangential speed. This means that the tangential speed of the block will increase the farther away it is placed from the center of the disk." I don't understnd why this is true
Two blocks, each of mass 2 kg are suspendedfrom the ends of a rigid massless rod of lengthL. The rod is held horizontally on the fulcrumand then released. The length L1 is 15 cm andthe length L2 is 85 cm. Draw the force diagram for the rod. Clearly label all forces. Write Newton’s 2nd Law equation: (for F of y) Write Newton’s 2nd Law equation: (for net torque) What is the magnitude of the linear acceleration of the block closest to the fulcrum? What is the magnitude of the linear acceleration of the block furthest from the fulcrum?
Three forces each 8 N are directed clockwise along the sides of an equilibrium triangle 5m on a side. Is the triangle in equilibrium with respect to (a) linear motion? (b) rotary motion? Determine the resultant force and the resultant torque about the center.
Force F = (5.58 N)î – (6.71 N )k acts on a pebble with position vector 7 = (2.79 m ) – (7.59 m ) k, relative to the origin. - What is the resulting torque acting on the pebble about (a) the origin and (b) a point with coordinates (3.43 m, 0, -3.30 m)? (a) Number i i k Units (b) Number i i i k Units
A centrifuge rotor rotating at 9000 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 2.41 m⋅N A) If the mass of the rotor is 4.04 kg and it can be approximated as a solid cylinder of radius 0.0310 mm , through how many revolutions will the rotor turn before coming to rest? B) How long will it take?
I need the answer as soon as possible