*3–20. A vertical force P= 10 lb is applied to the ends ofthe 2-ft cord AB and spring AC. If the spring has anunstretched length of 2 ft, determine the angle 0 forequilibrium. Take k = 15 lb/ft.3–21. Determine the unstretched length of spring AC if aforce P = 80 lb causes the angle 0 = 60° for equilibrium.Cord AB is 2 ft long. Take k = 50 lb/ft.2 ft-2 ftВwwkProbs. 3–20/21

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*3–20. A vertical force P= 10 lb is applied to the ends of the 2-ft cord AB and spring AC. If the spring has an unstretched length of 2 ft, determine the angle 0 for equilibrium. Take k= 15 lb/ft.

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

*3–20. A vertical force P= 10 lb is applied to the ends of
the 2-ft cord AB and spring AC. If the spring has an
unstretched length of 2 ft, determine the angle 0 for
equilibrium. Take k = 15 lb/ft.
3–21. Determine the unstretched length of spring AC if a
force P = 80 lb causes the angle 0 = 60° for equilibrium.
Cord AB is 2 ft long. Take k = 50 lb/ft.
2 ft-
2 ft
В
ww
k
Probs. 3–20/21

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