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A cylindrical tank of height 2 m with a crossesctional area of 0.5 m2 contains hot water at 80?C, 125 kPa. It is in a room with temperature T0 = 20?C, so it slowly loses energy to the room air proportional to the temperature difference as
with the tank surface area, A, and C is a constant. For different values of the constant C, estimate the time it takes to bring the water to 50?C. Make enough simplifying assumptions so that you can solve the problem mathematically, that is find a formula for T(t).
A refrigerator compressor compresses 0.5 kg/s of saturated R-134A vapor at -10C to 1000 kPa and 50C. The compresser has a point that is not insulated and losess heat to the surroundings,
An observer standing on a beach can just see the top of a lighthouse 15 miles away. The eye height of the observer abouve sea level is 5.7 feet. what is the height of the lighthouse above sea level? Show your work.
A reaction in a batch system is assumed to be first order. Data listed below was collected. Determine the reaction rate constant. chemical concentration (ug/L) time(min) 19.3 6
The bottom bar is made up of an aluminum bar and a steel bar, each 10 in. long placed in the parallel configuration at 70 F. That is also heated to 300 F.
The force on the piston is such that it maintains a constant pressure of 400 kPa inside. A valve is now opened nad steam at 1 MPa, 200 degrees C is allowed to enter the cylinder until the volume inside increases to 0.04 m^3.
A thermoelectric refrigerator is powered by a 12-V car battery that draws 3 A of current when running. The refrigerator resembles a small ice chest and is claimed to cool nine canned drinks, 0.350-L each, from 25 to 3°C in 12 h. Determine the aver..
You will probably have to guess at some of the hidden features, but try to produce a complete, plausible detail. Add explanatory notes to make everything clear.
Vision Technologies Inc., is a small company that uses ultra-wideband technology to develop devices that can detect objects (including people) inside of buildings, behind walls, or below ground.
What pressure gradient along a streamline, dp/ds, is required to accelerate water upwards in a pipe at 0.5 m/s^2 ? The incline is 1:10, i.e., 1 m upward for every 10 m horizontal.
Water in the amount of 1 lb is contained in a rigid closed tank. Initially the water has a quality of 0.4 at a pressure of 10 lbf/in2. Through a stirrer, work is provided to the water in the tank until the pressure quadruples.
What are the basic components of a building. Discuss the main requirements of each part to fulfill its primary function.
The water pressure in the municipal pipeline is 450 kPa, the sum of the local loss coefficients in the building pipes is 11.0, and the flow to be delivered to the top floor at 25 L/s through a 150-mm diameter PVC pipe.
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