When water boils, it .... stays at constant temperature while releasing heat. O gets hotter while absorbing heat. gets hotter while neither releasing nor absorbing heat gets hotter while releasing heat. stays at constant temperature while absorbing heat.
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- 36. In a heat engine, what material can we "theoretically" use as the working substance? (a) Only an ideal gas (such as air), due to their thermodynamic properties. (b) We can use liquids but not solids, since liquids can conform to the shape of their containers (engine), but solids cannot. (c) Any material which expands upon heating can be used.Suppose an object with initial temperature ?! is placed in a sealed container, which is in turn placed in a medium with temperature ?%. Let the initial temperature of the container be ?!. Assume that the temperature of the object does not affect the temperature of the container, which in turn does not affect the temperature of the medium. (These assumptions are reasonable, for example, if the object is a cup of coffee, the container is a house, and the medium is the ) Assuming that the container and the medium have distinct temperature decay constants ? and ?% respectively, use Newton’s law of cooling to find the temperatures ?(?) and ?(?) of the container and object at time ?. Assuming that the container and the medium have the same temperature decay constant ?, use Newton’s law of cooling to find the temperatures ?(?) and ?(?) of the container and object at time ?. Find the limiting values of temperatures ?(?)and ?(?)Q:33)
- The burner on an electric stove has a power output of 2.0 kWkW. A 780 gg stainless steel tea kettle is filled with 20∘C∘C water and placed on the already hot burner. f it takes 3.3 minmin for the water to reach a boil, what volume of water, in cm3cm3, was in the kettle? Stainless steel is mostly iron, so you can assume its specific heat is that of iron. Express your answer using two significant figures.How long does it take a 750-WW coffeepot to bring to a boil 0.85 LL of water initially at 18 ∘C∘C? Assume that the part of the pot which is heated with the water is made of 360 gg of aluminum, and that no water boils away. Ignore the heat loss to the surrounding environment. The value of specific heat for water is 4186 J/kg⋅C∘J/kg⋅C∘ and for aluminum is 900 J/kg⋅C∘J/kg⋅C∘. Express your answer using two significant figures. In secondsWhich would cause a more serious burn: 30 g of steam or 30 g of liquid water, both at 100 °C; and why is this so? O Water, because its specific heat is greater than that of steam. O Steam, because of its specific heat capacity. O Water, because it is denser than steam. O Steam, because of its latent heat of vaporization. O Either one would cause a burn of the same severity since they are both at the same temperature.