Gce Model Questions Vol1 2025 Physics Question 12
Practice objective / multiple choice question 12 from the 2025 Gce Model Questions Vol1 Physics examination.
A horizontal cylindrical pipe of length 1 m carries hot water at an inner temperature of \(80^{\circ}\text{C}\). The pipe wall consists of an inner steel layer (thermal conductivity \(k_{1}=45\ \text{W\,m}^{-1}\text{K}^{-1}\), thickness \(0.005\ \text{m}\)) and an outer insulation layer (thermal conductivity \(k_{2}=0.06\ \text{W\,m}^{-1}\text{K}^{-1}\), thickness \(0.020\ \text{m}\)). The outer surface is exposed to still air at \(20^{\circ}\text{C}\) with a convective heat‑transfer coefficient \(h=15\ \text{W\,m}^{-2}\text{K}^{-1}\). The inner radius of the steel tube is \(0.050\ \text{m}\). Determine the rate of heat loss from the pipe per metre length (in watts, to two significant figures).
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About This Question
This is Gce Model Questions Vol1 2025 Physics Question 12. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Physics examination.
Difficulty level: Medium .
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