Warm air flows through a rectangular, uninsulated heating duct in your cold attic during the winter. The air has a mass flow rate of 0.47 kg/sec, and the heating duct has dimensions of 20.0cm by 28.0cm with a length of L = 9.60m. The inlet temperature of the air is 42.0°C, at a pressure of 1.00 atm. Your cold attic keeps the surface temperature of the duct at a temperature of 8.0°C. Find the heat transfer rate.
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Warm air flows through a rectangular, uninsulated heating duct in your cold attic during the winter. The air has a mass flow rate of 0.47 kg/sec, and the heating duct has dimensions of 20.0cm by 28.0cm with a length of L = 9.60m. The inlet temperature of the air is 42.0°C, at a pressure of 1.00 atm. Your cold attic keeps the surface temperature of the duct at a temperature of 8.0°C. Find the
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- A welder using a tank of volume 8.00×10-2 m³ fills it with oxygen (with a molar mass of 32.0 g/mol) at a gauge pressure of 3.10x105 Pa and temperature of 38.3°C. The tank has a small leak, and in time some of the oxygen leaks out. On a day when the temperature is 24.0° C, the gauge pressure of the oxygen in the tank is 1.65×105 Pa. Part A Find the initial mass of oxygen. Express your answer in kilograms. IV—| ΑΣΦ m = 0.47 Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remaining Part B Find the mass of oxygen that has leaked out. Express your answer in kilograms. VE ΑΣΦΑ m = Submit ? Request Answer ? kg kgTwo small containers, each with a volume of 100 cm3, contain helium gas at 0°C and 1.25 atm pressure. The two containers are joined by a small open tube of negligible volume, allowing gas to flow from one container to the other. What common pressure will exist in the two containers if the temperature of one container is raised to 110°C while the other container is kept at 0°C? atmI've posted the below question earlier, and I received the answer. This is the question: A J-shaped tube is filled with air at 760 Torr and 22 °C. The long arm is closed off at the top and is 100.0 cm long; the short arm is 40.00 cm high. Mercury is poured through a funnel into the open end. When the mercury spills over the top of the short arm, what is the pressure on the trapped air? Let h be the length of mercury in the long arm. I need further explanation of one step: - when P2 is obtained in the short arm, the equation is 40-h+P1 1. How did we get this equation? 2. the short arm does not contain any air, why do we create an equation of P2 in the short arm? Please clarify these concerns. I have received the answer shown in the attached picture but it is not correct.