A horizontal pipe 10 cm in diameter and 3000 cm long is filled with a sand of 20 % porosity. The permeability of the sand is estimated to be 250 md. The sand is saturated with an oil of viscosity 0.65 cp, and the same oil is injected into the sand pipe. You are asked to calculate

a. What is the Darcy velocity in the sand pipe under a 100-psi pressure differential?

b. What is the flow rate through the sand pipe under a 100-psi pressure differential?

c. Calculate the oil contained in the pipe and the time needed to displace it at the rate of 0.055 cm3/sec using another fluid which has the same properties with oil but it is cheaper so that it is profitable to replace with oil.

d. If there is an immobile water saturation of 30% in the sand (i.e. water does not flow only oil flows) what will be the flow rate to oil under a pressure differential of 120 psi (assume permeability is reduced to 200 md due to presence of immobile water)

Design a wall footing to support a 30cm − wide reinforced

concrete wall with a dead load DL =293 KN/m and a live load

LL = 218 KN/m. The bottom of the footing is to be 1. 2m below the

final grade, the soil weighs 16 KN m3 ⁄ , the allowable soil

pressure, qa = 192 KN m2 ⁄ , and there is no appreciable sulfur

content in the soil. fy = 420MPa and fc′ = 21MPa, normal-

weight reinforced concrete with density equal to 23. 5 KN m3 ⁄ .

A square foundation 1.5? × 1.5? is founded at a depth of 1.5 m below the ground surface in
sand soil having a cohesion ?
′ = 0 ?? ?2 ⁄ and angle of shearing resistance∅
′ = 33°
. The water
table is at a depth of 6 m below ground level. The unit weight of soil above the water table is
? = 18 ?? ?3 ⁄ and the saturated unit weight of the soil ???? = 19 ?? ?3 ⁄ .Use the General
Bearing Capacity Equation. Determine the net allowable bearing pressure for a factor of safety
of 3.

1. A developer proposes to construct a new housing project. The relevant data are:

Determine the present and future peak discharge and total runoff from a 150-mm 24-h storm. If all flow in excess of the present flow must be stored, how much reservoir capacity is required? The average slope is 1 percent.

1. On what basis would Aristotle have determined whether an action was moral?

A 4 m-wide tank with height of 1.8 m filled with water is pulled with a cable inclined at 30o to the horizontal. The constant acceleration value in the cable direction is 4 m/s². The water depth is measured as 1.5 m before the motion starts.  Determine the angle between the water surface and the horizontal.  Compute the maximum and minimum pressure values on the bottom of the tank.  How many volume of water are spilled?

Q 1: Design a concrete mix for the following performances and ingredients:

* Compressive strength at 28 days = 32 MPa, slump 80 mm

* Crushed coarse aggregate of max size 20 mm readily available

* Fine aggregate is river sand, fineness modulus = 2.5

* Cement Strength Class = 42.5

* Specific gravity of combined aggregate =2.6

* Water absorption of coarse aggregate = 0.8%

* Water absorption of fine aggregate = 0.5%

Q 2: Design a concrete mix for the following performances and ingredients:

* Characteristic compressive strength 50 N/mm2 at 7 days

* Defective rate 1 %

* Previous control data: standard deviation 5 N/mm2

* Cement: class 52.5 * Slump required, 30-60 mm

* Maximum cement content 550 kg/m3

* Coarse aggregate: Crushed single sized 10 mm

* Fine aggregate: Uncrushed with 45% passing 600 μm sieve

* Relative density of aggregate: 2.7 (assumed)

* Volume of trial mix: 0.08 m3

. In your own words , explain the predominant aging mechanisms in the short-term and the long-term aging in bituminous materials.?

Select the Lightest weight W-section of A992 steel to serve as a column 30 feet long and to carry an axial live compressive load of 160 kips. The member is pinned at the top and bottom. The member's self weight is estimated at 2000 lbs. It is supported at mid-height in its weak direction,

A concrete masonry unit has actual gross dimensions of 7-5/8” x 7-5/8” x 7-5/8”. The unit is tested in a compression machine with the following results:

            Failure load = 98,000 lb

            Net volume = 348.1 in³

1. Is the unit categorized as solid or hollow?
2. Calculate the gross area compressive strength.
3. Calculate the net area compressive strength.

please answer by typing, i will rate your answer.

thanks

Describe the similarities and differences between flexural-torsional buckling and

lateral-torsional buckling. What is the coupling mechanism for each of these buckling modes?

What is the manufacturing process of CMUs?