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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?
it takes 15 seconds to raise a 1200 kg car and the supporting 300 kg hydraulic lift platform to a height of 2.8 m. the
the ice cap at the north pole may be 1000 m think with a density of 920 kgm3. find the pressure at the bottom and the
The disk rotates about the shaft S, while the shaft is turning about the z axis at a rate of vz = 4 rad>s, which is increasing at 2 rad>s2. Determine the velocity and acceleration of point A on the disk at the instant shown. No slipping occurs.
Determine the compressive force C and the shear force S supported by this disk in terms of the body weight W. The weight Wu of the upper torso (above the disk in question) is 68% of the total body weight W and acts at G1.
room temperature water flows through a 5-cm-diameter pipe that has a 180 degree vertical bend. the total linear length
a bubble of air is suspended in clean water at ambient pressure and temperature.a how do the pressure and the number of
A supply of steam at a pressure of 4 MPa and a temperature of 332°C (state 1) is used to do mechanical work as it expands to a pressure of 100 kPa and a quality of 90% (state 2). During the expansion process, 60 kJ/kg of heat is removed from the wate..
In the position shown, the angular velocity and the angular acceleration of the rod AB are 4 rad/sec and 6 rad/sec2, respectively, both counterclockwise. For this instant calculate the velocity and acceleration of collar A. ( AB = 600 mm)
A closed system contains 2 kg of Nitrogen at 27 C initially. The gas is heated to a final temperature of 277 C. Determine the total amount of heat required when the heat addition is done in.
a campaign sign weighing 68 pounds is suspended from the middle of a cable stretched across a street between two
during a race the dirt bike was observed to leap up off the small hill at a at an angle of 60o from the horizontal. if
Calculate the depth h below the surface to the top of the line of floats. Also find the angle e made by the line of floats with the horizontal at A - Determine the force T which must be applied to cause the cable configuration
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