Sample Problem 5/1 A flywheel rotating freely at 1800 rev/min clockwise is subjected to a variable counterclockwise torque which is first applied at time t = 0. The torque produces a counterclockwise angular acceleration a = 4t rad/s2, where t is the time in seconds during which the torque is applied. Determine (a) the time required for the flywheel to reduce its clockwise angular speed to 900 rev/min, (b) the time required for the flywheel to reverse its direction of rotation, and (c) the total number of revolutions, clockwise plus counterclockwise, turned by the flywheel during the first 14 seconds of torque application. CW Solution

Sample Problem 5/1 A flywheel rotating freely at 1800 rev/min clockwise is subjected to a variable counterclockwise torque which is first applied at time t = 0. The torque produces a counterclockwise angular acceleration a = 4t rad/s2, where t is the time in seconds during which the torque is applied. Determine (a) the time required for the flywheel to reduce its clockwise angular speed to 900 rev/min, (b) the time required for the flywheel to reverse its direction of rotation, and (c) the total number of revolutions, clockwise plus counterclockwise, turned by the flywheel during the first 14 seconds of torque application. CW Solution

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Sample Problem 5/1
A flywheel rotating freely at 1800 rev/min clockwise is subjected to a
variable counterclockwise torque which is first applied at time t = 0. The
torque produces a counterclockwise angular acceleration a = 4t rad/s2,
where t is the time in seconds during which the torque is applied.
Determine (a) the time required for the flywheel to reduce its clockwise
angular speed to 900 rev/min, (b) the time required for the flywheel to
reverse its direction of rotation, and (c) the total number of revolutions,
clockwise plus counterclockwise, turned by the flywheel during the first
14 seconds of torque application.
CW
Solution

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