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The owners of a house on a private lake are thinking of using "pumped storage" as a means of reducing their electricity bills. They will pump water from the lake up to a large reservoir overnight, and then during times of peak power prices, release the water to run back down to the lake, through a turbine, generating power for the house. In this case, the large reservoir (a big pond) is located 8 m (vertical) above the water level of the lake. The piping used to pump water into the reservoir is 20 cm in diameter; the pump is at the same level as the lake. The homeowners plan to restrict the flowrate to 0.2 m3/s. What is the minimum power required for the pump in this case?
metals are usually crystalline and seldom amorphous. most ceramics are crystalline but there are significant examples
calculate the average distance moved in one day by smoke particles in air for the following cases a smoke diffuses in
the turbine of a steam power plant operating on a simple ideal rankine cycle produces 500kw of power when the boiler is
If the flow rate of the water is to be maintained at 3.15*10-3 m3/s and the water temperature remains constant at 16oc ,estimate the power rating of the motor required to drive the pump.
a boat and trailer are being pulled along a bumpy road at a velocity v. the contour of the road can be approximated by
Liquid ethanol (C2H5OH) at 778F, 1 atm enters a combustion chamber operating at steady state and burns completely with dry air entering at 3408F, 1 atm. The fuel flow rate is 50 lb/s, and the equivalence ratio is 0.8. Products of
A pump station has been designed to lift water out of a 6 metre deep pit (vented to atmosphere) via a centrifigual pump mounted at ground level. Calculate the Net Positive Suction Head (NPSH) for the system ?
an automobile tire with a volume of 0.6m3 is inflated to a gage pressure of 200 kpa. calculate the mass of air in the
a four-cylinder spark ignition engine has a compression ratio of 8 and each cylinder has a maximum volume of 0.6l. at
An elevator descends from rest with an acceleration of 5 ft>s2 until it achieves a velocity of 15 ft>s. Determine the time required and the distance traveled.
A torsional helical spring is used to hold a door closed. The handle on the door is located 30 inches from the center of the torsional helical spring. The pull on the handle should be 1 pound when the door is closed and 3 pounds after the door has ..
Consider a vertical, single-pane window of equivalent width and height (W = L = 1m). The interior surface is exposed to the air and walls of a room, which are each at 18°C.
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