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Question: 

How high must a pointed arch be if it is to span a space 8.0 m wide and exert one-third the horizontal force at its base that a round arch would?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$12 \textrm{ m}$

Giancoli 7th Edition, Chapter 9, Problem 57

(5:20)

Chapter 9, Problem 57 is solved.

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