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Jack and Sill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. Jack has mass 75.0 $\mathrm{kg}$ , Jill has mass 45.0 $\mathrm{kg}$ and the crate has mass 15.0 $\mathrm{kg}$ . They remember that they must fetch a pail of water, so each jumps horizontally fromthe top of the crate. Just after each jumps, that person is moving away from the crate with a speed of 4.00 $\mathrm{m} / \mathrm{s}$ relative to the crate. (a) What is the final speed of the crate if both Jack and sill jump simultancously und in the same direction? (Hint: Use an inertial coordinate system attached to the ground, (b) What is the final speed of the crate if Jack jumps first and then a few seconds later Jill jumps in the same direction? (c) What is the final speed of the crate if fill jumps first and then Jack, again in the same direction?

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(a) $3.56 \mathrm{m} / \mathrm{s}$(b) $5.22 \mathrm{m} / \mathrm{s}$(c) $4.66 \mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

University of Washington

Simon Fraser University

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.

10:57

Jack and Jill are standing…

08:43

02:31

You stand on raft of mass …

06:03

(II) A large crate of mass…

05:11

Two crates, one with mass …

02:16

Three ice skaters meet at …

04:57

Jonathan and Jane are sitt…

06:54

A crate, in the form of a …

05:24

Jack (mass $55.0 \mathrm{~…

07:01

Jack (mass 55.0 kg) is sli…

10:59

08:01

Jumping to the ground. A 7…

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