In a hydroelectric power plant, water flows from an elevation of 400 ft to a turbine, where electric power is generated. for an overall turbine-generator efficiency of 86 percent, determine the flow rate of water to generate 100 kw of electricity if the irreversible head loss of the piping system between the free surfaces of the inlet and the outlet is 36 ft. take the density of water to be p= 624 ibm/t2 the flow rate of water is

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W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.