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A horizontal pre-stressing force of 750kn is applied to a rectangular concrete beam to be used as a structural member of a traffic bridge. The beam has a depth of 500mm and a width of 250mm. The for
If clean groundwater flows through an aquifer contaminated with a dense non- aqueous phase liquid (DNAPL), calculate the concentration of DNAPL in the water as a function of time if the DNAPL is dis
If log KSO, calcite (CaCO3(s)) = -8.61 at 50 oC, would calcite be over- or under- saturated in a hot water heater at 50 oC if the water was in equilibrium with calcite at 25 oC (log KSO = -8.30) whe
The frame is desinged to carry the hanging mass at G equal to 167 kg. The frame is supported by a pin connection at C and the rope AB, and constructed with pin connections at points E, F, and D.
Steam enters an adiabatic turbine steadily at 3 MPa and 300 *C and leaves at 70 Kpa and 100 *C. If the power output of the turbine is 2 MW, determine a) the isentropic efficiency of the turbine and
Air is compressed from an initial state of 100 kpa and 170 *C to a final state of 600 kpa and 57 *c. Determine the entropy change of air during the compression process by using a) property values fr
The frame is designed to carry the hanging mass at G equal to 167 kg. The frame is supported by a pin connection at C and the rope AB, and constructed with pin connections at points E, F, and D. Imp
The shape below has a cut along the entire length of the member thus making it an open section. The uniform thickness is 0.125in. Determine the maximum shear stress for the shape. Compare the stress
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.
Member ABC is composed of two sections. Section AB has an outside diameter of 60mm and inside diameter of 50mm, whereas section BC is solid. Find the maximum shear stress due to the 1.5kN·m t
The uniform steel shaft has two gears attached to it at B and C, two frictionless bearings, and the motor. The motor generates 15kip·in and the gears consume 10kip·in and 5kip·i
The steel uniform shaft has four pulleys attached to it and frictionless bearings at its ends. The pulley at B is connected to a motor that is driving the system. The other three pulleys are consumi
If the allowable shear stress is 15ksi, determine the diameter of a solid shaft if it is to transmit 50hp at a frequency of (a) 900rpm, (b) 1800rpm
Thomas Friedman's bestseller, The World is Flat, says that the world has been, in his words, "flattened" or leveled which increases accessibility and competition worldwide. What does this mean for
A 1-inch elevator cable is 1000 feet long. The modulus of elasticity for the cable is 25,000,000 psi. Determine the total elongation of the cable due to a load of 20,000 pounds.
Alkaloids are chemical compounds containing nitrogen that can be produced by plant cells. In an experiment, an insulated closed vessel 1.673 m3 in volume was injected with a dilute water solution co
A permeation membrane separates an inlet air stream (79 mol% N2, 21 mol% O2) into a permeate stream and a reject stream. The inlet stream conditions are 293K, 0.5 MPa and 2 mol/min; the conditions f
a). Determine the state of stresses in the walls and indicate these stresses (including arrows to denote the direction of the stresses) on the element below. b). Then, determine the maximum in-plane
Determine the percent error n in replacing the sine and the tangent of an angle by the value of the angle in radians for angle values 5 degrees, 10 degrees, and 20 degrees. Explain the qualitative d
What does algorithm compute - what is its basic operation and how many times is the basic operation executed?
A hotel room has a floor area of 10 m by 4 m and is 2.5 high and has a window which is 1.6 m high and 3 m wide. The room contains some furniture and other commodities containing 50 kg polyurethane w
A concrete building has floor area 10 m by 20 m and is 4 m high. THe building has four windows with a height 1.6 m and a width 2 m. After 10 minutes gases in the room have an average temperature of
An industrial building has floor area of 5 m by 8 m and is 3 m high with a door 1 m wide and 2 m high. Leakage of transformer oil from a pump occurs and is ignited. What is the maximum area of spill
A steady fire with an energy release rate of 500 kW occurs in a room 3m wide, 3m long, and 2.4 m high, with a door opening which is 1.8 m high and 0.6m wide. the ambient temperature is 20 degree cel
The VMA of a mixture is 15.0% and the air voids are 4.0%.If the aggregate has a specific gravity (bulk dry) of 2.700 g/cm3 and percent binder absorbed (by the mass of aggregate) is 0.5%, calculate the