In a simple non-ideal Rankine cycle, saturated water from condensed steam flowing at 15 kg/s, 20 kPa enters an boiler feed pump and is discharged at 6 MPa. The pump efficiency is 85% What is the duty (work requirement) to the pump?

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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

//(b) both involve the use of levers;