Q1. The member OA rotates about a horizontal axis through O with a constant counter clockwise velocity w=2 rad/s. As it passes the position 0 = 0°, a small block of mass m is placed on it at a radial distance r = 400 mm. (a) If the block is observed to slip at 0 = 50°, determine the coefficient of static friction us between the block and the member. (b) Before the block slips, calculate the value of 0 at which there is no frictional force applied to the mass. (c) At a later stage, the angular velocity is increased from 2 rad/s to 7 rad/s in 3 seconds. The angular acceleration is known to be a = k t, where t is time. Find k. %3D

Q1. The member OA rotates about a horizontal axis through O with a constant counter clockwise velocity w=2 rad/s. As it passes the position 0 = 0°, a small block of mass m is placed on it at a radial distance r = 400 mm. (a) If the block is observed to slip at 0 = 50°, determine the coefficient of static friction us between the block and the member. (b) Before the block slips, calculate the value of 0 at which there is no frictional force applied to the mass. (c) At a later stage, the angular velocity is increased from 2 rad/s to 7 rad/s in 3 seconds. The angular acceleration is known to be a = k t, where t is time. Find k. %3D

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

Q1. The member OA rotates about a horizontal axis through O with a constant counter
clockwise velocity w=2 rad/s. As it passes the position 0 = 0°, a small block of mass m is
placed on it at a radial distance r = 400 mm.
(a) If the block is observed to slip at 0 = 50°, determine the coefficient of static friction
us between the block and the member.
(b) Before the block slips, calculate the value of 0 at which there is no frictional force
applied to the mass.
(c) At a later stage, the angular velocity is increased from 2 rad/s to 7 rad/s in 3
seconds. The angular acceleration is known to be a = k t, where t is time. Find k.
%3D
m
Figure Q1

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