The table below shows some mechanical properties of two cylindrical engineering test rods, X and Y.
| Rod | Young modulus / GPa\text{GPa}GPa | Diameter / mm\text{mm}mm |
|---|---|---|
| X | 70 | 2.0 |
| Y | 210 | 3.0 |
The rods X and Y have the same initial length and are subjected to the same tensile load. Both rods obey Hooke's law.
What is the value of the ratio extension of Xextension of Y\displaystyle \frac{\text{extension of X}}{\text{extension of Y}}extension of Yextension of X?
0.750.750.75
1.31.31.3
4.54.54.5
6.86.86.8
15 exam-style questions on OCR A A Level Physics Materials, covering Springs and Mechanical properties of matter. Each one has a worked solution and a mark scheme showing where the marks go.