Explain why a body of water freezes from the top down rather than from the bottom up.

Typical freshly cut "green" firewood contains about 50% water by weight; for seasoned wood, the comparable figure is about 20%. Firewood is usually sold by volume, so compare the energy available from a given volume of green wood with that available from seasoned wood. Assume an energy content of 20 MJ/kg for perfectly dry wood, and that 2.3 MJ/kg of energy is needed to vaporize water. Also assume that the wood has essentially the same volume whether green or seasoned.

#10: Can you clearly show the work for this question

A 1.19-kg sample of water at 13°C is in a calorimeter. You drop a piece of steel with a mass of 0.31 kg at 224°C into it. After the sizzling subsides, what is the final equilibrium temperature? Make the reasonable assumptions that any steam produced condenses into liquid water during the process of equilibration and that the evaporation and condensation taken together don't affect the outcome, as we'll see later. Hint   The final equilibrium temperature of water and steel is °C. If the water is in a glass beaker with a mass of 0.2 kg, which in turn is in a calorimeter, with the beaker at the same temperature as the water, how will this affect the answer? Try answering before doing a detailed calculation.   Final temperature will be higher but not significantly so. Final temperature will be significantly lower. Final temperature will be lower but not significantly so. Final temperature will be significantly higher.   Using the setup in (b), the final equilibrium temperature of…

Your car’s radiator is made of steel and is filled with coolant. You fill the radiator to the very top with coolant, then drive off without remembering to replace the cap. As the coolant and steel radiator heats up, will the level of coolant drop or rise and overflow? why? what is a radiator is and what purpose does it serves in a car?  Here is a good start: https://youtu.be/y5p31F_dVJU