A stationary disc resting on a rotating disc A solid homogeneous disk (cylinder) A of 10 kg whose radius is 30 cm rotates at 4 rad/s on a frictionless horizontal surface. On disk A, place a solid and homogeneous disk B of 5 kg, the radius of which is 20 cm (the centers of the two disks are located one above the other). Disc B is initially stationary, but due to the friction between the two discs, it eventually spins same angular velocity as disk A. (a) Determine the final angular velocity of the disks. (b) Calculate the percentage of initial kinetic energy that has been transformed by friction into thermal energy.

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)...
icon
Related questions
icon
Concept explainers
Question

A stationary disc resting on a rotating disc

A solid homogeneous disk (cylinder) A of 10 kg whose radius is
30 cm rotates at 4 rad/s on a frictionless horizontal surface. On disk A, place a solid and homogeneous disk B of 5 kg, the radius of which is 20 cm (the centers of the two disks are located one above the other). Disc B is initially stationary, but due to the friction between the two discs, it eventually spins same angular velocity as disk A.
(a) Determine the final angular velocity of the disks.
(b) Calculate the percentage of initial kinetic energy that has been transformed by friction into thermal energy.

Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps with 3 images

Blurred answer
Knowledge Booster
Moment of inertia
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
College Physics
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
Physics for Scientists and Engineers
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:
9780321820464
Author:
Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:
Addison-Wesley
College Physics: A Strategic Approach (4th Editio…
College Physics: A Strategic Approach (4th Editio…
Physics
ISBN:
9780134609034
Author:
Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:
PEARSON