Blog categorized as Thermal Physics

Conduction and radiation of heat

Q- An iPod is left running inside a thin insulating case 2.5 mm thick with thermal conductivity of 0.02 W/K/m. The case is black and at 25 degrees Celsius and exchanges energy with it's surroundings, all of which are at 20 degrees Celsius, by radiation alone. What is the temperature inside the case?

February 16,2026 09:58 PM
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Efficiency of an Engine

Efficiency of an Engine

Q- One mol of an ideal monatomic gas is used as the working substance in an engine. The engine operates on the cycle shown in the diagram. Processes BC and DA are reversible and adiabatic. What is the efficiency of the engine? 

Solution:

December 21,2025 10:28 PM
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