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A mining firm makes annual deposits of $250,000 into a reclamation fund for 20 years. If the firm must have $10 million when the mine is closed;
what interest rate must the investment earn?
Determine the normal depth in a trapezoidal channel with a bottom width of 6.4 ft and side slopes of 1 vertical to 2 horizontal. The discharge is 85 ft3/s. Manning's roughness factor is 0.025 and the channel bottom slope is 0.001
Consider a wide flange steel beam of size W10x60 subjected to a negative bending moment of 24 kip ft. Calculate the maximum compressive and maximum tensile stresses and indicate where the stress will be tensile and where compressive.
The tank has an inside diamater of 100 cm and will be subjected to a maximum internal pressure of 820 kPa. The allowable tensile stress in the wall is 83 MPa, and the allowable tensile stress in the weld is 55 MPa.
The water pressure in the municipal pipeline is 450 kPa, the sum of the local loss coefficients in the building pipes is 11.0, and the flow to be delivered to the top floor at 25 L/s through a 150-mm diameter PVC pipe.
A rectangular steel plate with thickness t=0.625 inches is subjected to normal stresses sigma x and sigma y.The strain in the x direction is known to be 0.00065 and the strain in the y direction is known to be 0.0004.
Consider an L-shaped breakwater that protects a small harbor dredged to a uniform depth of 6 m. For a 2 m high, 10 s period incident wave at the head of the breakwater having incident wave direction of 60 degrees
convert the azimuths from north to bearings, and compute the angles, smaller than 180 degrees between successive azimuths 68o06'42", 133o15'56", 217o44'05", 320o35'18"
A water treatment llant and the water treatment plant removes calcium hardness (Ca2+) by precipitating (making) CaCO3(s). If, after establishing equilibrium with CaCO3(s), the dissolved Ca2+ concentration is 10 mg/L and the pH is 10.5.
From a photograph one observs that on a level section of highway 20% of the vehicles are trucks, 80% are cars, and that there are 50 vehicles per mile of highway. The trucks travel at 40 mph, the cars at 50 mph.
The pipe has an outside diameter of 60mm and an inside diameter of 50mm. Find the torsional moment T if the maxiumum shear stress is 80MPa.
8 Forces of 10.0 N north, 20.0 N east, and 15.0 N south are simultaneously applied to a 4.00 kg mass as it rests on an air table. Determine the magnitude and direction of the object's acceleration.
the weigt w causes atension of 100 lb ic cable cd. if d=2ft, what is the moment about the z axis due to the force eserted by he cable cd at point c.
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