A passenger bus in Zurich, Switzerland, derived its motive

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

Problem 86P Chapter 9

University Physics | 13th Edition

  • 2901 Step-by-step solutions solved by professors and subject experts
  • Get 24/7 help from StudySoup virtual teaching assistants
University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

4 5 0 356 Reviews
19
3
Problem 86P

A passenger bus in Zurich, Switzerland, derived its motive power from the energy stored in a large flywheel. The wheel was brought up to speed periodically, when the bus stopped at a station, by an electric motor, which could then be attached to the electric power lines. The flywheel was a solid cylinder with mass 1000 kg and diameter 1.80 m; its top angular speed was 3000 rev/min. (a) At this angular speed, what is the kinetic energy of the flywheel? (b) If the average power required to operate the bus is 1.86 × 104 W, how long could it operate between stops?

Step-by-Step Solution:

Solution 86P Problem (a) Step 1: To calculate Kinetic Energy K Mass of the cylinder M = 1000 Kg Diameter of the cylinder D = 1.80 m Radius R = 0.9 m Angular speed = 3000 rev/min Step 2: 1 2 Kinetic Energy K = I 2 Where I is the moment of inertia of the cylinder I = MR 2 2 I = 1 1000 (0.9) 2 2 * * 2 I = 405 Kgm Step 3: Angular speed must be converted into SI standard 2 1 rev/min = 60rad/s. Therefore = 3000 * 2 60 = 314.15 rad/s Step 4: 1 2 Kinetic Energy K = I 2 1 2 K = 2 * 405 *14 K = 2.00x10 J The kinetic energy of the flywheel is 2.00x10 J 7 Problem (b) Step 1: Average Power required for the bus P = 1.86 x 10 W 4 To find the time required to operate the bus Energy Time t = Power

Step 2 of 2

Chapter 9, Problem 86P is Solved
Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

×
Log in to StudySoup
Get Full Access to University Physics - 13 Edition - Chapter 9 - Problem 86p

Forgot password? Reset password here

Join StudySoup for FREE
Get Full Access to University Physics - 13 Edition - Chapter 9 - Problem 86p
Join with Email
Already have an account? Login here
Reset your password

I don't want to reset my password

Need help? Contact support

Need an Account? Is not associated with an account
Sign up
We're here to help

Having trouble accessing your account? Let us help you, contact support at +1(510) 944-1054 or support@studysoup.com

Got it, thanks!
Password Reset Request Sent An email has been sent to the email address associated to your account. Follow the link in the email to reset your password. If you're having trouble finding our email please check your spam folder
Got it, thanks!
Already have an Account? Is already in use
Log in
Incorrect Password The password used to log in with this account is incorrect
Try Again

Forgot password? Reset it here