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Motion of the Center of Mas1

# Motion of the Center of Mas1 - Motion of the Center of Mass...

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Motion of the Center of Mass The collision force acting between the target and the projectile is an internal force of the system under consideration consists of these two objects. The motion of the center of mass of a number of objects is solely determined by the external forces acting on the system (see Chapter 9). This equation shows that if no external forces act on the system, the velocity of its center of mass is constant. Sample Problem 10-4 In a nuclear reactor, newly-produced fast neutrons must be slowed down before they can participate effectively in the chain-reaction process. By what fraction is the kinetic energy of a neutron (mass m 1 ) reduced in a head-on collision with a nucleus of mass m 2 (initially at rest) ? Suppose v 1i is the initial velocity of the neutron. Its final velocity, v 1f , can be obtained using one of the previously derived equations: The initial kinetic energy of the neutron is given by The final kinetic energy of the neutron is given by The fraction of the kinetic energy of the neutron lost in the collision is given by

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Motion of the Center of Mas1 - Motion of the Center of Mass...

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