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COMEDK · Physics · 10. Mechanical Properties of Solids

A crane with a steel cable of length \(11 \mathrm{~m}\) and radius \(2.0 \mathrm{~cm}\) is employed to lift a block of concrete of mass 40 tons in a building site. If the Young's modulus of steel is \(2.0 \times 10^{11} \mathrm{~Pa}\), what will be roughly the increase in the length of the cable while lifting the block?
(Take, \(g=10 \mathrm{~ms}^{-2}\) )

  1. A \(0.75 \mathrm{~cm}\)
  2. B \(1.25 \mathrm{~cm}\)
  3. C \(1.75 \mathrm{~cm}\)
  4. D \(2.50 \mathrm{~cm}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(1.75 \mathrm{~cm}\)

Step-by-step Solution

Detailed explanation

Given, length, \(l=11 \mathrm{~m}\) Radius, \(\quad r=2 \mathrm{~cm}\) Radius, \(\quad=2 \times 10^{-2} \mathrm{~m}\) Mass, \(m=40\) tons \[ =4 \times 10^{4} \mathrm{~kg} \] Increase in length, \(\Delta l=\) ? We know that, Young's modulus,…