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$0.100-\mathrm{kg}$ stone rests on a friction-less, horizontal surface. A bullet of mass 6.00 $\mathrm{g}$ , traveling horizontally at 350 $\mathrm{m} / \mathrm{s}$ , strikes the stone and rebounds horizontally at right angles to its original direction with a speed of 250 $\mathrm{m} / \mathrm{s}$ . (a) Compute the magnitude and direction of the velocity of the stone after it is struck. (b) Is the collision perfectly elastic?

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(a) $v_{A 2}=25.8 \mathrm{m} / \mathrm{s}, 35.5$ o from the original direction of the bullet andopposite to the rebouns direction.(b) Not perfectly elastic

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

University of Winnipeg

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.

15:56

A 0.100-kg stone rests on …

04:17

A stone with a mass of $0.…

09:33

A Ricocheting Bullet. 0.10…

04:00

07:34

A Ricocheting Bullet. A $0…

09:06

A $5.00-\mathrm{g}$ bullet…

06:21

A 5.00-g bullet moving wit…

05:28

A 5.00 -g bullet moving wi…

01:38

07:47

A $4.00$ -g bullet is movi…

03:54

A 0.020-kg bullet is shot …

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