4) The figure below is a testing device used to measure the coefficient of friction between two materials (although it looks a bit like a record player). The disk is rotating at -20k rad/s and the length of the arm is 0.3m. At t = 0 the arm is put into motion with a rotational speed of 10k rad/s and the timer records how long it takes for the arm to reach a speed of rotation equal to that of the disk. Assume the elapsed time is 2.5 s. The normal force between the tip and the disk is 2N and lo = 0.015 kg-m?. a) Explicitly define the correct coordinates for the rotating system and write out the

4) The figure below is a testing device used to measure the coefficient of friction between two materials (although it looks a bit like a record player). The disk is rotating at -20k rad/s and the length of the arm is 0.3m. At t = 0 the arm is put into motion with a rotational speed of 10k rad/s and the timer records how long it takes for the arm to reach a speed of rotation equal to that of the disk. Assume the elapsed time is 2.5 s. The normal force between the tip and the disk is 2N and lo = 0.015 kg-m?. a) Explicitly define the correct coordinates for the rotating system and write out the

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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