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A $4.00-\mathrm{g}$ bullet, traveling horizontally with a velocity of magnitude 400 $\mathrm{m} / \mathrm{s}$ , is fired into a wooden block with mass 0.800 $\mathrm{kg}$ , initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 120 $\mathrm{m} / \mathrm{s} .$ The block shides a distance of 45.0 $\mathrm{cm}$ along the surface from its initial position. (a) What is the coefficient of kinetic friction between block and surface? (b) What is the decrease in kinetic energy of the bullet? (c) What is the kinetic energy of the block at the instant afterthe bullet passes through it?

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a. 0.222b. $-291 \mathrm{J}$c. $0.784 \mathrm{J}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

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.

06:07

A 4.00-g bullet, traveling…

02:21

09:03

AS.OO-g bullet; traveling …

03:49

400 m is fired into a wood…

03:40

A bullet with a mass of 4.…

04:56

A 5.00 -g bullet is fired …

18:50

A 5.00-g bullet is fired h…

03:47

A A 4.25 g bullet travelin…

01:42

A $60-\mathrm{g}$ bullet i…

09:06

A $5.00-\mathrm{g}$ bullet…

01:38

A 5.00 -g bullet moving wi…

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