The A-36 steel drill shaft of an oil well extends 12,000 ft into the ground. Assuming that the pipe used to drill the well is suspended freely from the derrick at A, determine the maximum average normal stress in each pipe string and the elongation of its end Dwith respect to the fixed end at A. The shaft consists of three different sizes of pipe, AB, BC, and CD, each having the length, weight per unit length, and cross-sectional area indicated. Hint: You will need to develop a series of FBDs to establish the necessary functions to integrate to determine the displacement. AAB = 2.50 in.² WAB=3.2 lb/ft 5000 ft B ABC= 1.75 in? WBC= 2.8 lb/ft 5000 ft C ACD= 1.25 in.² 2000 ft WCD=2.0 lb/ft D

Elements Of Electromagnetics
7th Edition
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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The A-36 steel drill shaft of an oil well extends
12,000 ft into the ground. Assuming that the pipe
used to drill the well is suspended freely from the
derrick at A, determine the maximum average
normal stress in each pipe string and the elongation
of its end Dwith respect to the fixed end at A. The
shaft consists of three different sizes of pipe, AB,
BC, and CD, each having the length, weight per unit
length, and cross-sectional area indicated.
Hint: You will need to develop a series of FBDs to
establish the necessary functions to integrate to
determine the displacement.
AAB = 2.50 in.²
WAB=3.2 lb/ft
5000 ft
B
ABC= 1.75 in?
WBC= 2.8 lb/ft
5000 ft
C
ACD= 1.25 in.²
2000 ft
WCD=2.0 lb/ft
D
Transcribed Image Text:The A-36 steel drill shaft of an oil well extends 12,000 ft into the ground. Assuming that the pipe used to drill the well is suspended freely from the derrick at A, determine the maximum average normal stress in each pipe string and the elongation of its end Dwith respect to the fixed end at A. The shaft consists of three different sizes of pipe, AB, BC, and CD, each having the length, weight per unit length, and cross-sectional area indicated. Hint: You will need to develop a series of FBDs to establish the necessary functions to integrate to determine the displacement. AAB = 2.50 in.² WAB=3.2 lb/ft 5000 ft B ABC= 1.75 in? WBC= 2.8 lb/ft 5000 ft C ACD= 1.25 in.² 2000 ft WCD=2.0 lb/ft D
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