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A mass of 0.2 kg of saturated refrigerant-134a is contained in a piston-cylinder device at 200 kPa. Initially, 75 percent of the mass is in the liquid phase. Now heat is transferred to the refrigerant at constant pressure until the cylinder contains vapor only. Show the process on a P-v diagram with respect to saturation lines. Determine (a) the volume occupied by the refrigerant initially, (b) the work done, and (c) the total heat transfer.
A wastewater treatment plant must disinfect its effluent before discharging the waste water to a near-by stream. The wastewater contains 4.5x10^5 fecal coliform colony-forming units (CFU) per liter.
How much (in addition to your trade-in value) can you afford to spend for a car averaging 30 mpg You expect to drive 15,000 mile/year and expect gasoline to cost $4.00/gallon and you will keep he car 10 years. Your personal interest rate is 6%/yea..
Determine the softening point of bitumen within the range 30 to 157°C by means of the Ring-and-Ball apparatus - discussion for softening point of bitumen 7.5oC
A lake has a water level which is used to determine if watering restrictions need to be implemented for the neighboring city. Water levels are measured on a weekly basis, and restrictions are placed if the lake level drops below 1060 ft.
If a mechanical device requires 450J of work to do 310J of work in lifting what is the efficiency of the device?
Radon from well water may pose a radiological health hazard. One treatment technique is simply to hold the water in storage, allowing the radon to decay. The decay rate is first order: Rn?>products;k=0.16day^?1 Consider a situation in which water is ..
A 100ft steel tape measure correctly when supported throughout its length under a tension of 1- lb and at a temperature of 72F.It is used on the field at a tension of 18 lb and supported at the two ends only.
A new after-school delinquency prevention program is being established. The Program Director calls you up on the telephone and asks your advice on how to design a good program. What advice can you give her?
a dense sand has an effective friction angle of 43 and c0. a dry 2.8-inch diameter sample is tested in drained triaxial
A bug is crawling up the leg of a man on a train. The velocity of the bug relative to the man is 0.3 m/s k . The mas is waling from one side of a carriage to the other with a vlocity relative to the train of 1.2 m/s j.
At the minimum volume reached during shrinkage, a specimen of soil has a void ratio of 0.87. if Gs = 2.72, calculate the shrinkage limit
A man weighing 80 Kg is moving from point A to Point G in the following wooden bridge. This bridge can be assumed as a beam. Draw the maximum reaction force due to the man's weight at points A and E. Also draw the maximum shear and moment force due t..
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