A steel wire 12mm in diameter is fastened to a log and then pulled by a tractor. The length of the steel wire between the log and the tractor is 11m. A force of 10000N is required to pull the log. What is the stress in the wire?
Correct answer: E. 88.46 MPa
- A. 33.12 MPa
- B. 44.12 MPa
- C. 66.15 MPa
- D. 77.29 MPa
- E. 88.46 MPa
Explanation
Stress (σ) = Force (F) / Area (A)Area (A) = π * (diameter/2)^2Area (A) = π * (12mm/2)^2Area (A) = π * (6mm)^2σ = 10000/ 3.14 (6 * 10-3)2σ = 88.46 MPa
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