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Hockey puck $B$ rests on a smooth ice surface and is struck by a second puck $A$ , which has the same mass. Puck $A$ is initially traveling at 15.0 $\mathrm{m} / \mathrm{s}$ and is defiected $25.0^{\circ}$ from its initial direction. Assume that the collision is perfectly elastic. Find the final speedof each puck and the direction of $B^{\prime}$ s velocity after the collision. [Hint: Use the relationship derived in part (d) of Problem 8.96 .

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$6.34 \mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

University of Sheffield

University of Winnipeg

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.

13:54

Hockey puck $B$ rests on a…

05:44

$\bullet$ A hockey puck $B…

06:43

Two identical pucks collid…

10:07

Two hockey pucks approach …

09:49

A hockey puck with mass $0…

06:02

A $170-\mathrm{g}$ hockey …

05:17

01:38

A blue puck with mass 0.04…

04:29

(II) A 0.450-kg hockey puc…

08:32

A young hockey player with…

03:53

(II) A $0.450-\mathrm{kg}$…

13:22

A $0.300-\mathrm{kg}$ puck…

04:40

The drawing shows a collis…

yeah in this question the following theater rooms the initial and final velocities of the no as the plot these initially act less and hence the initial velocity of what It was 20 and the masses of what works and we are equal so on applying low off conservation of and energy eager even equals A. That means while divided by and even Be a one square Was one divided by two. And even people are gonna be even where Equal to one divided by two. And it do be able square less one divided by and we do the you do yeah now here we substantive zero for we be well therefore bigger we even square it was you the IT to distress plus we B two square let's see right this for we be too therefore we get we be to equal so despaired of we everyone is square minus he a two is spared no applying no of conservation mm momentum how long origin and bigger we even plus we even once will be if you was 25 degrees plus we you need to was to no experience the situation for bruschetta therefore Wall street to equal still we Ayman plus we evil minus we you do was depart degree. Do I buy B B mm Now we named this as equation one now on applying no of conservation. Well momentum along were people I think that we need to Sign 25 Degree. It wants to me video All right here Now next really is the situation for scientific that was scientific equals two the do sign 25° divided by we be too. Now we consider this as equation. No no on standing and adding situation one and oh bigger we we do square equal to be everyone is scrapped plus B. It is square minus two. We even my diploma but we a new course 25 degree. Now here we substitute be even square minus we ate to scrap what we be to strap. Therefore begin being even square minus we A two square equal to we A one square less the au square minus to B. Even our people will be able to Post 25 Degree. So from a bow very we two equals two. The even Was 25 daily. Now here we substitute 15 m per second for we haven therefore figured me A two equals two 15 mighty level was 25 degree. Therefore be a. It was still 13.59. Make that for a second And the velocity of a is 13 1 59 m per second quarter. Approximately 13.6 m for a second. No. Uh huh. Island velocity. Uh uh huh. B is calculated by VB two. It was to straddle of we even the square minus will two square. Now here we substitute 13.59. Meeting for a second for viator And 15 we can for a second for the area. So we get we be to it wants to the square root or 15 only square -13.59. So we got we we do is it will do 6.329. Meet up for 2nd. Or we can write this. We'd be to equal to 6.4 m second. Hence the velocity of part B. It was to 6.34 metre but second now we have to find out the direction of velocity of being so on. Up line. Law of conservation. Well America alone, the our people bigger the A. Two sign 25 degree equals two. We we to sign kid rock. Now on the appearance in the public question for tita bigger T. Type where you sign in verse the E. Two signed 25 degree divided by we be you now here for substituting 13.59 m per second for Vh two and 6.339. Made up for a second for B. B. Two ego cheetah It was to sign in verse our team 0.59. My people I was signed and define divided by 6.3 T nine. So we got tita it was too 65. I agree Before the direction of publicity of P. It was 265 dignity

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