A projectile in flight explodes into several

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12. A projectile in flight explodes into several fragments. The total momentum of the fragments immediately after this explosion: (a) is less than the momentum of the projectile immediately before the explosion (b) has been changed into radiant energy (c) is more than the momentum of the projectile immediately before the explosion (d) has been changed into kinetic energy of the fragments (e) is the same as the momentum of the projectile immediately before the explosion 4 13. Two disks are mounted on low-friction bearings on a common shaft. The first disc has rotational inertia I and is spinning with angular velocity ω . 2 ω ω I 2 I The second disc has rotational inertia 2 I and is spinning in the same direction as the first disc with angular velocity 2 ω as shown. The two disks are slowly forced toward each other along the shaft until they couple and have a final common angular velocity of: (a) ? 3 ω (b) b 7 3 ω (c) ω (d) 5 3 ω 4 (e) 3 ω 14. A light string of length 3 R is attached to the surface of a solid uniform sphere of radius R and mass M and used to suspend the sphere from the ceiling. The rotational inertia of this system about the point of attachment at the ceiling is: 6
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15. At the same instant that a 0.50 kg-ball is dropped from 25 m above Earth, a second ball, with a mass of 0.25 kg, is thrown straight upward from Earth’s surface with an initial speed of 15 m/s. They move along nearby lines and pass without colliding. At the end of 2.0 s the acceleration of the center of mass of the two-ball system is: 16. A particle is released from rest at the point x a and moves along the x -axis subject only to the conservative force with associated potential energy function U p x q shown. U p x q x a e b c d The particle: 7
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