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A small house is built in the arctic. It has four square walls of 500 ft2 each. For simplicity, we will assume it has no windows, and we are only interested in calculation the heat loss through the four walls. A total of one hundred Watts (100 kW) escape through the four walls.
a) Calculate the Thermal Conductivity ( K ) in W/(m K) given the following data:
X: Thickness of walls is six inches ( 6" )
T1 : inside temperature is ( 60 F )
T2 : outside temperature is ( - 50 F )
b) Calculate the Thermal Conductivity ( K ) in BTU/(s.ft. oR)
Hint: British Thermal Unit (BTU) is the American system unit for energy.
calculate the cracking moment (resisting moment) for an unreinforcedconcrete beam that is 10 in. wide, 16 in. high. assume normal weight concrete with 3000 psi = f prime sub c. use the internal couple method and check with the flexure formula.
At the end of 15 years, the first motor will have a salvage value of $50 and the second motor will have a salvage value of $100. consider the MARR to be 8%. (note : 1HP=0.7457 kw). Determine which motor should be installed based on the PW criterio..
A civil engineering student contends that 60 mph is safe in a van because of the higher driver's eye height. If all other design inputs are standard, what must the driver's eye height in the van be for the student's claim to be valid
Set up a table showing curve elevations at the PVC, at the PVT, and at the half-station points along the curve. Compute the station and elevation of the curve turning point.
Given that uniform flow is subcritcal and there is a constriction in a rectangular channel, how do you determine what the constricted width would be to force the flow to be critical. Draw this transition on a specific energy curve.
Oil of a specific gravity of 0.75 is flowing through a 6-in pipe under a pressure of 15 psi. If the total energy relative to the datumplate is 8.0 ft below the center of the pipe is 58.6 ft, determine the flow rate of the oil.
An industry discharges PCE (tetrachloroethene, tetratchloroethylene, or perchloroethylene) into a small, well-mixed lake. The influent concentration is 0.4mg/L and the hydraulic residence time of the lake is 5days.
Calculate the distance traveled by the prey from the time it is dropped until the time it hits the ground. Express your answer correct to the nearest tenth of a meter.
The horizontal motion of plunger and shaft is arrested by resistance of the attached disk which moves through the oil bath. If the velocity of plunger is v.
A 170 kg granite rock (ρ = 2700 kg/m 3 ) is dropped into a lake. A man dives in and tries to lift the rock. Determine how much force the man needs to apply to lift it from the bottom of the lake. Do you think he can do it?
Photovoltaic array, Under insolation conditions of 500 W/m^2 (direct sunlight), and 10% solar cell efficiency
If both tanks are well-mixed and remain at constant volume, what is the steady-state concentration (in mg/L) of chromate (CrO42-) in the effluent water leaving the second tank?
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