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sm8 84

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PROBLEM (8.84) Solve Prob. 8.83, assuming that the gas pressure is p = 100 kPa.
SOLUTION
Total pressure at any depth:
p = 100(103 ) + γ (h − y )
(a) At y = h :
p = 100(103 ) Pa
t=
pr
σ all
=
100(103 )5000
= 3.3 mm
150 × 106
(b) At y = h 4 :
p = 100(103 ) + 15(103 )15 = 325(103 ) Pa
325(103 )5000
= 10.8 mm
150 × 106
(c) At y = h 2 : :
p = 100(103 ) + 15(103 )10 = 250(103 ) Pa
t=
t=
250(103 )5000
= 8.33 mm
150 ×106
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