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A 20.0 -kg projectile is fired at an angle of $60.0^{\circ}$ above the horizontal with a speed of 80.0 $\mathrm{m} / \mathrm{s}$ . At the highest point of its trajectory, the projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial speed. You can ignore air resistance. (a) How far from the point of firing does the other fragment strike if the terrain is level? (b) How much energy is released during the explosion?

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(a) $849 \mathrm{m}$ from the firing point.(b) $1.60 \times 10^{4} \mathrm{J}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Simon Fraser University

University of Sheffield

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.

04:14

A 20.0-kg projectile is fi…

08:06

8.96 CPA 20.0 kg { project…

01:28

0:00

A 20.0 kg projectile is fi…

07:32

momentumA 20.0 kg proj…

05:41

A fircworks rocket is fire…

07:55

A fireworks rocket is fire…

06:23

A projectile that is fired…

02:36

A projectile with a mass o…

03:45

A projectile of mass 2 kg …

A $2.00-\mathrm{kg}$ proje…

(III) A 224 -kg projectile…

10:08

A projectile of mass $2.0 …

09:40

$A 12.0 \mathrm{~kg}$ shel…

02:47

A projectile is launched w…

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