AP Physics 2
9.5 Specific Heat and Thermal Conductivity
Four metal bars of different materials have identical length \(L = 0.20\text{ m}\) and cross-sectional area \(A = 1.0 \times 10^{-3}\text{ m}^2\). The thermal conductivities of the metals are given in the table below.
One end of the aluminum bar is held at a constant temperature of \(100^\circ\text{C}\) while the other end is held at \(20^\circ\text{C}\). Assuming heat flows only along the length of the bar, what is the rate of thermal energy transfer through the aluminum bar?
| Metal | Thermal Conductivity \(k\text{ (W/(m}\cdot\text{K))}\) |
|---|---|
| Steel | 50 |
| Iron | 80 |
| Aluminum | 200 |
| Copper | 400 |
One end of the aluminum bar is held at a constant temperature of \(100^\circ\text{C}\) while the other end is held at \(20^\circ\text{C}\). Assuming heat flows only along the length of the bar, what is the rate of thermal energy transfer through the aluminum bar?
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