Problem 1 A 1-m long copper rod of diameter 2.0 cm is initia…
Problem 1 A 1-m long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100 °C. It is now exposed to an air-stream at 20 °C with a heat transfer coefficient of 200 W/m2-K. The volume is 3.1416 x 10-4 m3. The surface area is 0.06283 m2. Copper properties: ρ = 8933 kg/m3 k = 401 W/m-K cp = 0.385 kJ/kg-K Determine the time (in seconds) for the copper rod to reach 25 °C.
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