Consider a 1000-W iron whose base plate is made of 0.5-cm-thick aluminum alloy 2024–T6 (r 5 2770 kg/m3, cp 5 875 J/kg·K, a 5 7.3 3 1025 m2/s). The base plate has a surface area of 0.03 m2. Initially, the iron is in thermal equilibrium with the ambient air at 22°C. Taking the heat transfer coefficient at the surface of the base plate to be 12 W/m2·K and assuming 85 percent of the heat generated in the resistance wires is transferred to the plate, determine how