A circular disk of mass U.D radius, rotating freely at 3.5 rad/s. a) Find the new angular velocity of the combination; rad/s b) The change in the kinetic energy? ally not c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the N m

A circular disk of mass U.D radius, rotating freely at 3.5 rad/s. a) Find the new angular velocity of the combination; rad/s b) The change in the kinetic energy? ally not c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the N m

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

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A circular disk of mass 0.5 kg and radius 21 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same
radius, rotating freely at 3.5 rad/s.
a) Find the new angular velocity of the combination;
rad/s
b) The change in the kinetic energy?
c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the original speed in 3 s?
ON m

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Step 2: Part(a) Calculate the new angular velocity of combination

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Step 3: Part(b) Calculate The change In the kinetic energy

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Step 4: Part (c) Calculate constant torque needed to regain the original speed in 3s

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