Thermodynamics
What does specific heat measure?
A 2 kg metal block requires 1000 J of heat to raise its temperature by 2°C. What is the specific heat of the metal?
Substance A has a specific heat of 2000 J/kg·°C, and substance B has a specific heat of 1000 J/kg·°C. If the same amount of heat is applied to equal masses of both substances, which substance will experience a larger temperature change?
Two substances, X and Y, are mixed in an insulated container. Substance X has a mass of 0.5 kg and an initial temperature of 80°C, while substance Y has a mass of 1.0 kg and an initial temperature of 20°C. The specific heat of X is 500 J/kg·°C, and the specific heat of Y is 1000 J/kg·°C. Assuming no heat is lost to the...
A 1 kg block of iron at 100°C is placed in 0.5 kg of water at 20°C. The specific heat of iron is 450 J/kg·°C, and the specific heat of water is 4186 J/kg·°C. Assuming the system reaches thermal equilibrium and no heat is lost to the surroundings, what is the approximate final temperature of the water?
A container holds 0.2 kg of water at 25°C. A 0.1 kg piece of metal at 100°C is placed in the water. The final temperature of the water and metal is 30°C. Assuming no heat is lost to the surroundings, what is the specific heat of the metal?
A composite wall consists of two layers: 0.1 m of brick ( W/m·°C) and 0.05 m of wood ( W/m·°C). If the temperature difference across the wall is 20°C, what is the rate of heat transfer per unit area through the wall?
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A glass window has a thickness of 0.005 m and an area of 2 m². The temperature on the inside surface is 25°C, and the temperature on the outside surface is 5°C. If the thermal conductivity of glass is 0.8 W/m·°C, what is the rate of heat transfer through the window?
A metal rod has a length of 2 m and a cross-sectional area of 0.01 m². One end is held at a temperature of 100°C, and the other end is held at 20°C. If the rate of heat transfer through the rod is 80 W, what is the thermal conductivity of the metal?
Material A has a thermal conductivity of 200 W/m·°C, and material B has a thermal conductivity of 100 W/m·°C. If both materials have the same dimensions and are subjected to the same temperature difference, which material will have a higher rate of heat transfer?