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The objects in Fig. 8.47 are constructed of uniform wire bent into the shapes shown. Find the position of the center of mass of each.

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a. $(L / 2) \cos (\alpha / 2)$b. $2(L / 2) / 3=L / 3$c. $(L / 2) / 2=L / 4$d. $(L / 3) \sin 60^{\circ}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Washington

Hope College

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.

07:20

The objects in Figure 8.51…

08:39

A thin, homogeneous wire i…

03:33

04:25

04:50

I have prevent. This is the problem. We start two dimensional religion here it is given for elastic religion theater A plus theater be with 90 degree so theater be you will get 19 minus theater A that is 65 degrees now Applying conservation off mo mentum for XX is well, you will get m A. We have one x Yeah, and I mean baby one x I am a be a two x because can be we toe X substituting the value mass off a Is Khartoum ass off given the problem. So here noted down I am a fiscal tow am bees Kal Toh am so do you. Me, right? We air one. It's called toe Be a toe cause off 25 plus b b two course up 65 Say the question But for y axis by direction before religion it is zero on after position it is Mm. We 8 to 5 minus m b b b to buy masses seem so It can be written as b B two cause off. Funny sign on 60 Pipe Toby is Kal Toh. Be eight to right. Sign off 25 So you will get baby toe. Why? Sorry, baby Toe. It's called toe. We ate toe in two. Sign off 25 upon side off 16 fight. So, from any question, Benito, we even you will get we ate toe cause off. Contain five less. Sign off 25 for us off 65 upon signed off 60 pipe and to be a two. So from here we get two people get okay, that is read A You will be 15 upon 1.103 That is 35 6 m per second. So after collision, having the velocity 13.6 m per second. Now, baby, too. You can find by a patient to 13.6. Sign off 25 upon. Sign off 65. So it would be for toe 6.35 So it's 6.34 m per second. That's all Thanks for watching it

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02:33

Bumpers on cars are not of much use in a collision. To seewhy,calculate the …