A hydroelectric power plant draws water from an open reservoir at a velocity of 280ft/s and subsequently releases the water to a river 26ft below the plant entrance at a velocity of 105ft/s. Assume the water temperature remains constant. a) Determine the amount of work delivered by the plant (BTU/Ibm). b) If the power delivered is 65% of that calculated in part a, what are the primary contributors to the efficiency loss