
Concept explainers
(a)
To Calculate: That how far the column has driven inside the earth on the 60th drive.
(a)

Answer to Problem 10P
The pile moves 0.011 m on the 60th drive.
Explanation of Solution
Given Information:
Piledriver pounds a steel column inside the earth.
The first penetration depth is 1.5m
Every succeeding drive moves the pile 92% of the previous depth penetrated into the earth.
Calculation:
With every drive keeps moving the pile moves 92% of the previous drive of the pile.
Considering the previous drive to be
Therefore,
Which is approximately 0.011 m
Hence, on the 60th drive the pile moves 0.011 m.
(b)
To Calculate: That what will be the total distance that the column moves after the 60th drive.
(b)

Answer to Problem 10P
The column moved 18.62 m after the 60th drive.
Explanation of Solution
Given Information:
Piledriver pounds a steel column inside the earth.
The first penetration depth is 1.5m
Every succeeding drive moves the pile 92% of the previous depth penetrated into the earth.
Calculation:
The series that will be formulated will be a geometric series with
Therefore,
Which gives and approximate distance of 18.62 m
Hence, the column moved 18.62 m after the 60th drive.
Chapter 11 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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