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The components of an electronic system dissipating 180 W are located in a 1.4 -m-long horizontal duct whose cross section is 20 cm ×20 cm . The components in the duct are cooled by forced air that enters the duct at 30^∘ C and 1 atm at a rate of 0.6 m^3 / min and leaves at 40^∘ C . Determine the rate of heat transfer from the outer surfaces of the duct to the ambient. | Numerade
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In the circuit shown in Fig. 26.48 , the rate at which R1 is dissipating electrical energy is 20.0 W . (a) Find R1 and R2 (b) What is the emf of the battery? (c) Find the current through both R2 and the 10.0-Ωresistor. (d) Calculate the total electrical power consumption in all the resistors and the electrical power delivered by the battery. Show that your results are consistent with conservation of energy. | Numerade
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An electronic device dissipating 20  W has a mass of 20  g, a specific heat of 850  J / kg ·K, and a surface area of 4  cm^2. The device is lightly used, and it is on for 5  min and then off for several hours, during which it cools to the ambient temperature of 25^∘ C. Taking the heat transfer coefficient to be 12  W / m^2 ·K, determine the temperature of the device at the end of the 5 -min operating period. What would your answer be if the device were attached to an aluminum heat sink having a
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