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18-66. The end A of the garage door AB travels along the horizontal track, and the end of member BC is attached to a spring at C. If the spring is originally unstretched, determine the stiffness k so that when the door falls downward from rest in the position shown, it will have zero angular velocity the moment it closes, i.e., when it and BC become vertical. Neglect the mass of member BC and assume the door is a thin plate having a weight of 200 Ib and a width and height of 12 ft. There is a similar connection and spring on the other side of the door. 12 ft B 5 ft 15 5t 7 ft 2 ft 6 ft 'D

18-66. The end A of the garage door AB travels along the horizontal track, and the end of member BC is attached to a spring at C. If the spring is originally unstretched, determine the stiffness k so that when the door falls downward from rest in the position shown, it will have zero angular velocity the moment it closes, i.e., when it and BC become vertical. Neglect the mass of member BC and assume the door is a thin plate having a weight of 200 Ib and a width and height of 12 ft. There is a similar connection and spring on the other side of the door. 12 ft B 5 ft 15 5t 7 ft 2 ft 6 ft 'D

Elements Of Electromagnetics
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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18-66. The end A of the garage door AB travels along the horizontal track, and the end of member BC is attached to a spring at C. If the spring is originally unstretched, determine the stiffness k so that when the door falls downward from rest in the position shown, it will have zero angular velocity the moment it closes, i.e., when it and BC become vertical. Neglect the mass of member BC and assume the door is a thin plate having a weight of 200 Ib and a width and height of 12 ft. There is a similar connection and spring on the other side of the door. 12 ft B 5 ft 15 5t 7 ft 2 ft 6 ft 'D
Transcribed Image Text:18-66. The end A of the garage door AB travels along the horizontal track, and the end of member BC is attached to a spring at C. If the spring is originally unstretched, determine the stiffness k so that when the door falls downward from rest in the position shown, it will have zero angular velocity the moment it closes, i.e., when it and BC become vertical. Neglect the mass of member BC and assume the door is a thin plate having a weight of 200 Ib and a width and height of 12 ft. There is a similar connection and spring on the other side of the door. 12 ft B 5 ft 15 5t 7 ft 2 ft 6 ft 'D
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