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Question: 

A sign (mass 1700 kg) hangs from the bottom end of a vertical steel girder with a cross-sectional area of $0.012 \textrm{ m}^2$.

  1. What is the stress within the girder?
  2. What is the strain on the girder?
  3. If the girder is 9.50 m long, how much is it lengthened? (Ignore the mass of the girder itself.)

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

Quick Answer: 
  1. $1.4 \times 10^6 \textrm{ N/m}^2$
  2. $6.9 \times 10^{-6}$
  3. $6.6 \times 10^{-5} \textrm{ m}$

Giancoli 7th Edition, Chapter 9, Problem 43

(1:16)

Chapter 9, Problem 43 is solved.

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