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Engineering, 30.10.2021 21:50 coreybro
Thế nào là bộ biến đổi xoay chiều – một chiều (Bộ chỉnh lưu có điều khiển hoàn toàn)?. Vẽ sơ đồ nguyên lý và so sánh sơ đồ chỉnh lưu thyristor hình cầu một pha tải thuần trở với chỉnh lưu thyristor tia hai pha tải thuần trở?
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Engineering, 04.07.2019 18:20, krojas015
Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?
Answers: 3
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Engineering, 04.07.2019 19:20, littlepotato10
To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.
Answers: 1
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Thế nào là bộ biến đổi xoay chiều – một chiều (Bộ chỉnh lưu có điều khiển hoàn toàn)?. Vẽ sơ đồ nguy...
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