Neco 2022 Physics Question 8
Practice essay / theory question 8 from the 2022 Neco Physics examination. This question covers Thermal stress, Linear expansion, Young's modulus, Specific heat capacity, Heat transfer, Convection .
A solid cylindrical rod of steel has a length of 0.500 m, a diameter of 20 mm and a density of 7850 kg·m⁻³. The coefficient of linear expansion of steel is \(\alpha = 1.2\times10^{-5}\ \text{K}^{-1}\) and its Young's modulus is \(E = 2.0\times10^{11}\ \text{Pa}\). The rod is fixed at both ends so that it cannot expand when heated. The yield strength of the steel is 250 MPa. The specific heat capacity of steel is 470 J·kg⁻¹·K⁻¹. The rod is placed in a water bath at 25°C and heated uniformly. The convective heat‑transfer coefficient between the rod surface and the water is \(h = 150\ \text{W·m}^{-2}\text{K}^{-1}\). Assume the water temperature remains constant at 25°C throughout the heating process.
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This is Neco 2022 Physics Question 8. It is one of the essay questions from the 2022 Neco Physics examination.
The question covers Thermal stress, Linear expansion, Young's modulus, Specific heat capacity, Heat transfer, Convection .
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