A 250 Kg cast iron car engine contains water as a coolant. Suppose the temperature of the engine is 35°C when it is shut off. The air temperature is 10°C. The heat given off by the engine and water in it, as they cool to air temperature is 4.4x106 J. What mass of water is used to cool the engine?

If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be a. lower than the mercury in the vessel, and shaped like the inside of a bowl. b. higher than the mercury in the vessel, and shaped like the inside of a bowl. c. lower than the mercury in the vessel, and shaped like the outside of an umbrella. d. higher than the mercury in the vessel, and shaped like the outside of an umbrella.