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Fission, the process that supplies energy in nuclear power plants, occurs when a heavy nucleus issplit into two medium-sized nuclei. One such reaction occurs when a neutron colliding witha $^{235} \mathrm{U}$ (uranium) nucleus splits that nucleus into a $^{141} \mathrm{Ba}$ (barium) nucleus and a $^{92} \mathrm{Kr}$ (krypton) nucleus. In this reaction, two neutrons also are split off from the original $^{235} \mathrm{U}$ Before the collision, the arrangement is as shown in Fig. 8.49 $\mathrm{a}$ . After the collision, the $^{141} \mathrm{Ba}$ nucleus is moving in the $+z$ -direction and the $^{92} \mathrm{Kr}$ nucleus in the $-z$ -direction. The three neutrons are moving in the $x y$ -plane, as shown in Fig. 8.49 $\mathrm{b}$ . If the incoming neutron has an initial velocity of magnitude $3.0 \times 10^{3} \mathrm{m} / \mathrm{s}$ and a final velocity of magnitude $20 \times 10^{3} \mathrm{m} / \mathrm{s}$ in the directions shown, what are the speeds of the other two neutrons, and what can you say about the speeds of the 141 $\mathrm{Ba}$ and $^{92} \mathrm{Kr}$ nuclei? (The mass of the 14 $\mathrm{Ba}$ nucleus is approximately $23 \times 10^{-25} \mathrm{kg},$ and the mass of $^{92} \mathrm{Kr}$ is about $1.5 \times 10^{-25} \mathrm{kg} . )$

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$=1.5 v_{\mathrm{Be}}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

Simon Fraser University

Hope College

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

09:55

Nuclear Fission. The unsta…

04:53

Moderating a Neutron In a …

07:27

06:16

01:13

The uranium isotope ${ }^{…

06:13

01:53

A Fission Chain Reaction A…

08:47

The mass excess of a nucle…

07:01

(a) Energy is required to …

01:55

At the beginning of Sectio…

06:43

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