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$\mathrm{A}^{232} \mathrm{Th}$ (thorium) nucleus at rest decays to a $^{228} \mathrm{Ra}$ (radium) nucleus with the emission of an alpha particle. The total kinetic energy of the decay fragments is $6.54 \times 10^{-13} \mathrm{J}$ . An alpha particle has 1.76$\%$ of the mass of a 28 Ra nucleus. Calculate the kinetic energy of (a) the recoiling 28 Ra nucleus and $(b)$ the alpha particle.

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$K_{B}=0.11 \times 10^{-13} \mathrm{J}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Cornell University

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

McMaster University

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.

07:59

$\mathrm{A}^{232} \mathrm{…

02:48

Radium-226 decays as ${ }_…

04:32

Radium- 226 decays as ${ }…

03:57

$A^{232}_{92} U$ nucleus, …

04:35

02:27

01:52

(II) The americium nucleus…

10:41

Find the $\mathrm{g}$ -val…

01:16

${ }^{226}$ Ra decays and …

01:44

01:28

Thorium $^{230}_{90}Th$ de…

02:40

43.54. Thorium $_{90}^{230…

03:47

$$\text { Find the ene…

04:27

In the radioactive decay o…

00:50

Find the energy (in MeV) r…

01:43

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