A 30 kg male emperor penguin under a clear sky in the Antarctic winter loses very little heat to the environment by convection; its feathers provide very good insulation. It does lose some heat through its feet to the ice, and some heat due to evaporation as it breathes; the combined power is about 12 W. The outside of the penguin’s body is a chilly −22°C, but its surroundings are an even chillier −38°C. The penguin’s surface area is 0.56 m2, and its emissivity is 0.97.a. What is the net rate of energy loss by radiation?b. If the penguin has a 45 W basal metabolic rate, will it feel warm or cold under these circumstances?
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
A 30 kg male emperor penguin under a clear sky in the Antarctic winter loses very little heat to the environment by
a. What is the net rate of energy loss by
b. If the penguin has a 45 W basal
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