On a hot summer day, you decide to make some iced tea. first, you brew 1.50 l of hot tea and leave it to steep until it has reached a temperature of ttea = 75.0 ∘c. you then add 0.975 kg of ice taken from the freezer at a temperature of tice = 0 ∘c. by the time the mix reaches equilibrium, all of the ice has melted. what are the interacting systems in this problem?

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). 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. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.