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In the USA the unit gpd/sqft (gallon per day per square foot) is often used to measure the hydraulic conductivity k, and the specific discharge q. In Europe the standard unit is m/s (meter per second), following the unification initiated by Napoleon around 1800. European scientists consider this to be more convenient, but the unit gpd/sqft has the advantage that the magnitude of a value is easier to imagine. Furthermore, European engineers may be tempted to think that the specific discharge is a velocity, because it is expressed in m/s. However, it is not, as the average velocity is v = q/n, where n is the porosity. American engineers will not have that idea, because they are used to express a velocity in mph, and that seems to be quite different from gpd/sqft. What is the relation between the two units?
a mixing chamber steadily mixes a hot water stream at 80degc and 0.5kgs rate with a cold water stream at 20degc. if the
The pressure is positive on the windward side of the hut and is negative on the leeward side. Determine the total horizontal shear Q on the foundation per unit length of roof mea- sured normal to the paper.
What are the advantages of this technique?
2/50 The mechanism of Prob. 2/16 is repeated here. For the conditions () = 40°, T = 150 N, and r = 200 mm, determine the moment about O of the tension T applied by cable AB to point A.
An engine burns 200 cubic feet per hour of natural gas with a heating value of 1000 btu/cubic feet. The engine produces 39.1 horsepower for this test. What is the average efficiency for this test? At what rate (btu/h) is heat rejected from this engin..
a mercury-in-glass thermometer has 12 gram of mercury in bulb. the design requires that if temperature increases by
Calculate the ultimate tensile strength (engineering) of a material whose strength coefficient is 700 MPa and a tensile test specimen which necks at an engineering tensile strain of 0.35.
a balanced wheel supported on springs is rotating at 1200 rpm. if a bolt weighing 15 g and located 5 cm from center
you are given a four-wheeled cart of mass 15 kg where the distance between a wheel and its nearest neighbors is 2 m.
As shown in Fig., two kilograms of water undergo a process from an initial state where the water is saturated vapor at 120°C, the velocity is 30 m/s, and the elevation is 6 m to a final state where the water is saturated liquid at 10°C, the veloci..
At the proportional limit, a 30 mm wide × 12 mm thick bar elongates 2.0 mm under an axial load of 41.5 kN. The bar is 1.5-m long. If Poisson’s ratio (ratio between longitudinal and lateral deformations) is 0.33 for the material, determine:
The air temperature in the oven is 350?C, and the convection coefficient between the air and the sensor is 40 W/m2 · ?C. What temperature will be indicated by the thermocouple?
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