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A room has walls and a ceiling that conduct heat from the room to the cooler outdoors. If the inside temperature is uniform at 25.2 Celcius and the outdoor temperature is at 16.8 Celcius. What is the heat transfer rate through conduction in Watts. The walls are 9 ft hight and the room has the dimension of 16 ft by 19 feet and the walls and ceiling all have a thermal conductivity of k = 0.51 W/m2K and a thickness of 56 cm. (Be careful, this is a mixed unit problem. Ignore conduction through the floor.)
Now our robotics team is trying to tighten one of the ¼" - 20 UNC bolts to hold on the wheels. They are using a wrench that is 6" long. They exert 10 lbs to pull the wheel toward its axle with 110 lbs of force. Fill in the values for this s..
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