onsider a room with a slightly open window. A heater is turned on, raising the temperature of the air in the room. Since the room is open to the atmosphere, the pressure is constant. Take the air to be a calorically perfect ideal gas, so the specific energy can simply be written as u = cvT , where T is the absolute temperaturein the room. With these assumptions, how does the total energy in the room, U, change as the temperature is increased? What happens to the energy input by the heater into the room? A simple explanation is sufficient - no need to derive ananalytical result.
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Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?
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onsider a room with a slightly open window. A heater is turned on, raising the temperature of the ai...
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