A copper rod and an aluminum rod of equal diameter are joined end to end in good thermal contact. The temperature of the free end of the copper rod is held constant at 100°C, and that of the far end of the aluminum rod is held at 0°C. If the copper rod is 0.30 m long, what must be the length of the aluminum rod so that the temperature at the junction is 50°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.
A copper rod and an aluminum rod of equal diameter are joined end to end in good thermal contact. The temperature of the free end of the copper rod is held constant at 100°C, and that of the far end of the aluminum rod is held at 0°C. If the copper rod is 0.30 m long, what must be the length of the aluminum rod so that the temperature at the junction is 50°C?
In conduction mode of heat transfer, heat is transferred from a hot temperature region to a cold temperature region.It will occur as long as there is a difference in temperature between the two regions. Once the two locations have reached the same temperature, thermal equilibrium is established and the heat transfer stops.
Other important factors that affect the rate of heat transfer are the materials involved, their area and length. The mathematical expression to calculate the rate of heat transfer, connecting the above variables is given as
Rate of heat transfer
where k is the thermal conductivity, A is the area of cross-section,is the difference in temperature and L is the distance or length.
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