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The outside wall of a refrigerated storage room is 10m long and 3m high and is constructed with 100-mm concrete blocks ( k=0.935W/m C) and 10 cm of fiber insulation board (k=0.048W/m C). The inside temp of the room is - 10 C and the convective heat transfer coefficient is 40 W/m2 K; the outside temp is 30 C with a convective heat transfer coefficient of 10 W/m2K on the outside wall surface. Calculate the overall heat-transfer coefficient. Please show work.
A 100-watt motor (60% efficient) is used to raise a 100-kilogram load 5 meters into the air. How long, in units of seconds, will it take the motor to accomplish this task?
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from time t0 to t5 hr radioactive steam is released from a nuclear power plant located at x -1 mile and y 3 miles.
a pitot-static tube used to measure air velocity is connected to a differential pressure gage. if the air temperature
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