R Figure P11.13

The figure shows a device that can be used to measure the speed of a bullet. The device consists of two rotating disks, separated by a distance of d = 0.922 m, and rotating with an angular speed of 90.8 rad/s. The bullet first passes through the left disk and then through the right disk. It is found that the angular displacement between the two bullet holes is = 0.360 rad. From these data, determine the speed of the bullet. Number i Bullet Units 19 kd + Motor

a top with radius 10cm, mass 2 kg has a string around the edge and is initially at rest. assume the top can be reasonably approximated as a solid cylinder. the top is held in place as the string is pulled. the string applies a force of 10N tangential to the edge for 2s. what is the angular velocity (in radians per second) of the top after 3 seconds? what is the angular momentum of the top after the string is pulled? after the string is pulled, the top is released. it travels away from its initial position at a linear velocity of 10m/s. what is the rotational velocity (in radians per s) at this top? assume no friction

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A solid cylinder of mass 4 kg and radius 2 m rotates with constant angular velocity of 5 rad/s about an axis through its center. What is the angular momentum of the cylinder?

A circular disc of mass M and radius R is rotating about its axis with angular speed ω1 . If another stationary disc having radius R/2 and same mass M is droped co-axially on to the rotating disc. Gradually both discs attain constant angular speed ω2. The energy lost in the process is p% of the initial energy. Value of p is

A ring (mass 4 M, radius 2 R) rotates in a CCw direction with an initial angular speed 2 w. A disk (mass 4 M, radius 2 R) rotates in a CW direction with initial angular speed 2 w. The ring and disk "collide" and eventually rotate together. Assume that positive angular momentum and angular velocity values correspond to rotation in the CCw direction. What is the initial angular momentum Lj of the ring+disk system? Write your answer in terms of MR2W. MR2W Submit Answer Tries 0/3 What is the final angular velocity wf of the ring+disk system? Write your answer in terms of w. Submit Answer Tries 0/3

Two particles, each of mass 3.45 x 104 kg and speed 6.22 m/s, travel in opposite directions along parallel lines separated by 7.50 cm. (a) What is the magnitude L of the angular momentum of the two-particle system around a point midway between the two lines? (b) Is the value different for a different location of the point? If the direction of either particle is reversed, what are the answers for (c) part (a) and (d) part (b)? (a) Number Units (b) (c) Number i Units (d)

Two particles, each of mass 3.45 x 10-4 kg and speed 6.22 m/s, travel in opposite directions along parallel lines separated by 7.50 cm. (a) What is the magnitude L of the angular momentum of the two-particle system around a point midway between the two lines? (b) Is the value different for a different location of the point? If the direction of either particle is reversed, what are the answers for (c) part (a) and (d) part (b)? (a) Number i Units (b) no : (c) Number Units (d) yes :

(hrw8c11p28) A particle P with mass 9 kg has position vector r (r = 6.0 m) and velocity v (v = 35.0 m/s) as shown in the figure. It is acted on by force F (F = 11.0 N). All three vectors lie in the xy plane. About the origin, what is the z-component of the angular momentum of the particle? About the origin, what is the z-component of the torque acting on the particle?