One end of an aluminum rod (50 cm long) is maintained at 1000C by immersing in a pot of boiling water and the other end at 00C by an ice-water mixture. If the cross-sectional area of the rod is 1.3 cm2, how much ice will the rod melt in 20 minutes? (thermal conductivity of Al is 205 W/m.0C) a) 0.19 kg b) 1.9 kg c) .019 kg
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.
One end of an aluminum rod (50 cm long) is maintained at 1000C by immersing in a pot of boiling water and the other end at 00C by an ice-water mixture. If the cross-sectional area of the rod is 1.3 cm2, how much ice will the rod melt in 20 minutes? (thermal
a) 0.19 kg
b) 1.9 kg
c) .019 kg
Now consider the same situation, but the 50 cm long rod is half aluminum (25 cm) and half copper (25 cm). The aluminum end is in boiling water. The copper end is in the ice-water mixture.
What would be the steady temperature of the Al-Cu junction?
a) 50 0C
b) 34.75 0C
c) 65.25 0C
How much ice will the rod melt in 20 minutes?
a) 0.025 kg
b) 0.25 kg
c) 2.5 kg
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