(1) A sphere of radius 0.500 m, temperature 27.0 C, and emissivity 0.850 is located in an environment of temperature 77.0 C. At what rate does the sphere (a) emit and (b) absorb thermal radiation? (c) What is the sphere’s net rate of energy exchange? (Stefan Boltzmann constant) = 5.67 x 10–8 W/m2 K 4 (2) A copper rod 24 cm long has cross-sectional area of 4 cm2 . One end is maintained at 24°C and the other is at 184°C. What is the rate of heat flow in the rod? The heat Conductivity of copper is 397 W/m · °C. (3) At 20 C, a brass cube has edge length 30 cm. What is the volume of the cube when it is heated from 20 C to 75 C? Coefficient of linear expansion of brass is 19 x 10-6 C
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.
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(1) A sphere of radius 0.500 m, temperature 27.0 C, and emissivity 0.850 is located in an
environment of temperature 77.0 C. At what rate does the sphere (a) emit and (b) absorb
thermal
constant) = 5.67 x 10–8 W/m2 K
4
(2) A copper rod 24 cm long has cross-sectional area of 4 cm2
. One end is maintained at
24°C and the other is at 184°C. What is the rate of heat flow in the rod? The heat
Conductivity of copper is 397 W/m · °C.
(3) At 20 C, a brass cube has edge length 30 cm. What is the volume of the cube when it is
heated from 20 C to 75 C? Coefficient of linear expansion of brass is 19 x 10-6
C
-1
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