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A fireworks rocket is fired vertically upward. At its maximum height of 80.0 $\mathrm{m}$ , it cxplodes and breaks into two picces, one with mass 1.40 $\mathrm{kg}$ and the other with mass 0.28 $\mathrm{kg}$ . In the explosion, 860 $\mathrm{J}$ of chemical energy is converted to kinetic energy of the two fragments. (a) What is the speed of each fragment just after the explosion? $(b)$ It is observed that the two fragments hit the ground at the same time. What is the distance between the points on the ground where they land? Assume that the ground is level and air resistance can be ignored.

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(a) $14.3 \mathrm{m} / \mathrm{s}$(b) $=4.04 \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Washington

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.

04:42

A fireworks rocket is fire…

07:55

03:01

05:41

A fircworks rocket is fire…

Fireworks rocket is fired …

12:24

11:55

A 20.0-kg projectile is fi…

08:06

8.96 CPA 20.0 kg { project…

03:44

In a fireworks display, a …

10:28

11:54

A test rocket is fired ver…

04:47

A test rocket is fired ve…

10:18

A fireworks rocket is laun…

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