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A room has a floor area of 500 m^2 and a height of 4 m. THe room is involved in a fire with a constant energy release rate of 1 MW. calculate the time till the smoke layer is 1.5 m from the floor for:
(a) the case where the leakage areas are at the floor level.
(b) the case where the leakage areas are at the ceiling level.
A gas occupise 250 ml and it's pressure is 550mm Hg @ 254C how many moles of gas are in this sample? (convert mm Hg to atm).
A 10 m diameter particle of unit density falls through air starting from rest. calculate the time required for the particle to attain 70% of the final terminal speed and the distance traveled by the particle during the time.
A biological reactor is used to treat wastewater from a small community (Q = 100,000 gpd). The influent BOD5 concentration to the reactor is 200 mg/L and the required effluent BOD5 concentration is 30 mg/L.
Write a balanced net equation for the reaction of the hydrogen ascorbate anion with water where hydrogen ascorbate acts as an acid.
A force of 100 000 N is applied to a 10 mm x 20 mm rectangular cross-section iron bar in tension. If the iron has a yield strength of 400 MPa and a tensile strength of 480 MPa, determine: whether the bar will plastically deform
Typical water supply at a faucet in any building is conveyed in copper pipe that is ½" in inside diameter, with a wall thickness of 0.040". If the water pressure is 50 psi and the valve is closed (meaning that water is not flowing)
A freeway exit ramp has a single 12-foot lane and consists entirely of a curve with a central angle of 90 degrees and L=628 feet. If the distance cleared of obstacles is 19.4 feet from the centerline, what design speed was used
A four- lane undivided multilane highway ( two lanes in each direction) has 11- ft lanes and 5- ft shoulders. At one point along the highway there is a 4% upgrade that is 0.62 mi long.
Why is the ‘time value of money' important for the evaluation of engineering projects? Provide at least one practical example to support your view (max 2 pages)
Property taxes,insurance and storage will run 5%.What is the owning cost for the dozer?Use the time value method to calculate the depreciated portion of the ownership cost.
Calculate the water/cement ratio of the cement paste in which all the cement will hydrate to leave no capillary pores. (density of cement: 3.1 g/cm3) ?
An ethanol plant distills alcohol from corn. The distiller processes 2.0 t/h of feed containing 15% alcohol and 82% water; the rest is inert material. The bottoms (waste) produced is 85% of feed and contains 94% water, 3.5% alcohol, and 2.5% inert..
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