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1. Consider the Hoover Dam hydro-electric plant located in Arizona and Nevada. If the average lake level is 160 m above the turbine outlet, determine the minimum mass flow rate of water through the 17 turbines if the total power produced from all four turbines is 2080 MW. What is the mass flow rate if the turbines are 88% efficient.?
2. What is the possible power (kW) production from a 32 m radius wind turbine if the average wind speed is 12 m/s? Assume an ambient air density of 1.20 kg/m3.
long circular rod passes through the opening in an oven having air temperature of 400 and is pressed firmly onto the
Calculate the torque on each of the two shafts,the power transmitted and the power lost in friction. U=0.3 what is the efficiency of the drive.
a particle travels along a straight line such that in 2 s it moves from an initial position sa 0.5m to a position sb
a frictionless poston-cylinder device initially contains air at 100 kpa and 0.15m3. at this state a linear spring f
one pound of nitrogen as an ideal gas expands isothermally at 70degf from a volume of 1 ft3 to a volume of 2 ft3.
Steam at 100 psia, 500oF is throttled to 20 psia. Changes in kinetic energy are negligible for this process. Determine the final temperature and specific volume of the steam.
consider the thin-walled beam section illustrated in the figure below. the beam has a vertical load of v 500 kn acting
a thin plastic membrane is used to separate helium from a gas stream. under steady-state conditions the concentration
a turbine is operated with an enthalpy at entrance of 1340 btulbm and an exit enthalpy of 1285 btulbm. if the entrance
a 14-ft long ladder leans against a wall with the bottom of the ladder placed 4ft from the base of the wall. how high on the wall will the ladder reach.
at a certain event 16 people attend and 5 will be chosen at random to receive door prizes. the prizes are all the
a bead a weighting 2lb slides on a quarter-circular frictionless bar bc with radius. the bead is supported by a cable
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