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A well of 0.1 m radius is part of a well point network to keep an excavation dry (Figure P6.13). The groundwater at the far edge of the excavation must be 0.5 m below the base.
(a) Calculate the radius of influence.
(b) Calculate the maximum drawdown.
(c) Plot the drawdown curve.
(d) For the radius of influence in (a),
(i) calculate the discharge if the well radius increases to 0.2 m, and
(ii) compare it to the discharge for the 0.1-m-radius well.
a solid shaft of radius r is subjected to a torque T, determine the radius r' of the inner core of the shaft that resists one half of the applied torque (T/2)
A rubber ball is inflated to a pressure of 65kpa. At that pressure, the diameter of the ball is 240 mm and the wall thickness is 1.25 mm.The rubber has a modulus of elasticity E of 3.6 MPa and a poisson's ratio of 0.48.
A geotechnical report has suggested an allowable bearing pressure of 200kPa. Determine the minimum size of the pad footing 2 metres wide for a steel column if a factor of safety of 2.0 is recommended
Nitrate concentrations exceeding 44.3 mg NO3-/L are a concern in drinking water due to the infant disease, methemoglobinemia. Nitrate concentrations are often recorded in units
Determine the maximum bending stress. Neglect the weight of the beam - Find the extreme fibre stresses at the middle sectionspan.
What additional data and information should he gather,and how should he go about gathering the data information ?
A piston-cylinder device contains 0.85 kg R-134a at 263K. The piston is free to move and has a mass of 12 kg and diameter of 25 cm. The atmospheric pressure is 98 kPa. Heat is added to the cylinder until the R-134 temperature = 10 o C.
Zwango Plus Manufacturing experts that fixed costs of keeping its Zephyr Hills Plant operating will be $1.4M this year. If the fixed costs increase by $100,000 each year, what is the EUAC for a 10-year period Assume the interest rate is 12%.
Given the heat transfer of the disk rotor is 120 W/m2/K, how much heat energy is radiatred from each of the disk rotors when the ambient air temperature is 30 C
a volumen of 20 cu ft of air at pressure of 50 psig is heated and expanded and to 30 cu ft and 40psig find the changes in the energy of air in jouls.
Calculate the the oritical oxygen demand (mg/L) of a solution containing 450 mg of glucose(C6H12O6) in 2 liters of distilled water.
A 3000 lb vehicle has a drag coefficient of 0.32 and a frontal area of 30 ft2. What is the minimum tractive effort required for this vehicle to maintain a 65 mph speed on a 2% upgrade through an air density of 0.002045 slugs/ft3
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