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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?
consider a pistoncylinder arrangement that has a linear spring mounted such that as the piston rises to a certain point
a balloon uses hot air to provide its lifting capacity. prior to its release it is tethered to the ground by a steel
1. What is the maximum number of homogeneous phases that can exist at equilibrium for a system involving
Describe IN DETAIL how you could determine the required rate of heat addition or removal.
a 250mm long brass bar cte 20.5x10-6 0c is setup as shown below. initially when the temperature is 150c there is a
Calculate the stress at a point away from the hole, to the right of the beam toward the end and Calculate the stress at the hole?
Final page of the website requires an example of the use of steam tables and mollies charts, Use the following information to show how the answer can be calculated using either of the two methods. A. Find the enthalpy of steam at 0.4 Mpa and 0.7 dryn..
a sample of tungsten w contains an edge dislocation. w can be treated as elastically isotro pi c and the dislocation is
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air contained in a piston-cylinder assembly contains air initially at 2 bar 300 k and a volume of 2 m3. the air
A 5-ft 3 rigid tank contains a saturated mixture of refrigerant-134a at 50 psia. If the saturated liquid occupies 20 percent of the volume, determine the quality and the total mass of the refrigerant in the tank
suppose air as an ideal gas satisfying the thermodynamic version of bernouillis equation flows down a pipe of radius r.
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