PhysicsHardHigh School (11–12)Heat & Thermodynamics › Calorimetry and Change of StateJEE AdvancedJEE Main
Created by StemPy LabA little water at stands in a well-insulated dish inside a chamber. The air is pumped out quickly, so the water boils, and the heat it needs to evaporate is taken from the water itself. In the end, all of the water has either evaporated or frozen. At the latent heat of vaporisation of water is and the latent heat of fusion is . What fraction of the water ends up as ice?
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← The wall of a house is 18 cm of brick, of thermal conductivity 0.60 W/(m K), covered on the outside by 6.0 cm of foam insulation, of thermal conductivity 0.050 W/(m K). On a cold night the inner face of the brick is at 25 °C and the outer face of the foam is at -5 °C. In the steady state, what is the temperature where the brick meets the foam? Give the answer in °C.A solid sphere floats in a liquid at 10 °C, with 0.980 of its volume below the surface. The sphere's material has a coefficient of linear expansion of 2.0 × 10⁻⁵ K⁻¹, and the liquid has a coefficient of volume expansion of 9.6 × 10⁻⁴ K⁻¹. The liquid and the sphere are warmed slowly together. Take each volume to grow as V = V₀(1 + γΔ T), with γ = 3α for the solid. At what temperature does the sphere begin to sink? →
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