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1. A hollow steel sphere with a 2-ft inside diameter and a 0.1-in.-thick wall contains water at 300 lbf /in.2, 500 F. The system (steel plus water) cools to the ambient temperature, 90 F. Calculate the net entropy change of the system and its surroundings for this process.
2. One lbm of air at 540 R is mixed with 2 lbm air at 720 R in a process at a constant 15 psia and Q = 0. Find the final T and the entropy generation in the process.
3. One lbm air at 15 psia is mixed with 2 lbm air at 30 psia, both at 540 R, in a rigid, insulated tank. Find the final state (P, T) and the entropy generation in the process.
Maintenance expenses for a bridge in Georgia are estimated to be $200,000 for the first eight years followed by two separate million dollar expenditures in years 12 and 18. The expected life of the bridge is thirty years.
Compare and contrast four-way traffic signal controlled intersections versus four-way roundabouts. In your response, discuss the safety implications of each as well as the traffic performance implications. Word limit is 500 words.
Discharge from an orifice of 75mm diameter is 0.02 m^3/s under a constant head of 3 m. An external mouthpiece of the same diameter is installed that raises the coefficient of contraction from 0.63 to 1.0.
A 2.5hr long uniform rainfall resulted in arunoff hydrograph that has the shape of an equilateral triangle.The base of the triangle is 64hr; the peak flow is 535cfs; thedrainage area is 5.7mi^2. Determine the corresponding unithydrograph if the base ..
Assuming both the turbine and the compressor to be isentropic, determine the temperature of the air leaving the turbine and entering the cabin.
When a fluid flows through a sharp bend, low pressures may developin localized regions of the bend. Estimate the minimumabsolute pressure (in psi) that can develop without causingcavitation if the fluid is water at 160 oF.
A permeability test was run on a compacted sample of dirty sandy gravel. The sample was 150 mm long and the diameter of the mold 150 mm. In 83 s the discharge under a constant head of 40 cm was to7 em3 The sample had a dry mass of 51(10 g and its ..
note about lightweight concreteits type and how to prepare proposal about new lightweight concrete innovation? ltbrgt
If the dry-rodded unit weight of an aggregate is 105 lb/ft3 (1680 kg/m3) and its specific gravity is 2.65, determine the void content.
Two remediation options are being considered for a contaminated land area formerly used for industrial operations. Option 1 involves removing all of the contaminated soil over a two-year period at a cost of 2.2$ million per year.
determine the rate of heat gain of the room, in Btu/h, when the air conditioner is running continuously to maintain a constant room temperature.
A water tank, 15 m in diameter and 10 m high, is proposed for a site where there is an existing pipeline (Figure P7.26). Plot the distribution of vertical and lateral stress increases imposed by the water tank on the pipeline along one-half the ci..
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