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(1) (a) What is the angular momentum of a 2.8 -kg uniformcylindrical grinding whecl of radius 18 $\mathrm{cm}$ when rotating at1300 rpm? $(b)$ How much torque is required to stop it in 6.0 s?

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a) 6.2 $\mathrm{kg} \cdot \mathrm{m}^{2} / \mathrm{s}$b) $-1.0 m . N$

Physics 101 Mechanics

Chapter 11

Angular Momentum; General Rotation

Moment, Impulse, and Collisions

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Rutgers, The State University of New Jersey

University of Washington

Simon Fraser University

University of Winnipeg

Lectures

02:21

In physics, rotational dynamics is the study of the kinematics and kinetics of rotational motion, the motion of rigid bodies, and the about axes of the body. It can be divided into the study of torque and the study of angular velocity.

04:12

In physics, potential energy is the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors. The unit for energy in the International System of Units is the joule (J). One joule can be defined as the work required to produce one newton of force, or one newton times one metre. Potential energy is the energy of an object. It is the energy by virtue of an object's position relative to other objects. Potential energy is associated with restoring forces such as a spring or the force of gravity. The action of stretching the spring or lifting the mass is performed by a force which works against the force field of the potential. The potential energy of an object is the energy it possesses due to its position relative to other objects. It is said to be stored in the field. For example, a book lying on a table has a large amount of potential energy (it is said to be at a high potential energy) relative to the ground, which has a much lower potential energy. The book will gain potential energy if it is lifted off the table and held above the ground. The same book has less potential energy when on the ground than it did while on the table. If the book is dropped from a height, it gains kinetic energy, but loses a larger amount of potential energy, as it is now at a lower potential energy than before it was dropped.

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(I) $(a)$ What is the angu…

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07:02

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(a) What is the angular mo…

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(II) $(a)$ What is the ang…

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( $a$ ) What is the angula…

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(II) (a) What is the angul…

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A grinding wheel has rotat…

04:33

Angular Momentum of a Rigi…

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An $8.0$ -kg wheel has a r…

02:18

A grinding wheel, with a m…

11:30

The angular momentum of a …

06:45

A 2.80-kg grinding wheel i…

03:56

A grinding wheel is in the…

so to find the angular momentum with lose question 11.1 it sees back. L is given by eye. It is moment off in a shared times Omega it is Ah, the angular velocity in down. So for radiance per second, I'm here I iss half a Mars Claire now reduced these values into the secretion. So we have half times the moss time St Pius So I will appeal small ass. These are basically the same. So this is equal door cedar 0.18 meters. Dead on omega is given in times off in units off revolutions per minute. So we have to convert it into readings for second now. So we know that one revolution is two by day, Deon. So 1300 revolutions, little cover and angle off to die by times 1300 Radiance on this is about This is, um, units off revolution sport. Minute. So we have to convert this minute in tow seconds, and we know that one minute is 60 seconds. So they we have odd omega in Don's offer in union itself. Radiance per second. No, we solved this the question, and we get Ellen to be six point 1715 Can you t Neither school was second, so this is the fourth spot for the second. But we have to find the dark. We know that dog is changing angular momentum for unique dying so mathematically we can write it to be l f minus l. I. Which is Belle Elle, or change in angle and momentum over. You need to dying. It's just a Latino on DDE. The final, angular momentum in zeros L f a c E o initial angular momentum is the one that we calculated in part. So we use that Well, we're here on, and dying is six seconds. So we saw this aggression on we get dark to the equal Do g meet those scared on immune itself or new done. This is equally do one born in Seattle New den dines Mita. The negative sign indicates that the talk is used to oppose the initial angle a moment, and this makes sense because the final angular momentum is zero. Therefore, this is they need to be a negative talk applied to decreased angular momentum to zero. This is Anil August's to applying a negative acceleration off the celebration when you are trying to slow down a particle and the final velocity zero are less than

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