On a winter day with a temperature of -10â°c, 500g of snow (water ice) is brought inside where the temperature is 18 â°c. the snow warms, then melts to water, and then warms to room temperature. what is the total amount of heat energy absorbed by the snow in this process

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.