A person makes ice tea by adding ice to 1.8 kg of hot tea, initially at 80eC. How many kilograms of ice, initially at 0eC, are required to bring the mixture to 10°C?

The reason ocean temperatures do not vary drastically is that:

A layer of insulating material with thermal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the composite sheet?

A block of ice at 0eC is added to a 150-g aluminum calorimeter cup that holds 200 g of water at 100C. If all but 2.00 g of ice melt, what was the original mass of the block of ice?

In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole of area 0.5 cm². The furnace acts like a blackbody radiator. If it is to be maintained at a temperature of 16500C, at what level should the power radiated through the hole be maintained?