A river flows at 2.5 m/s (average speed) with a volumetric flow rate of 500 m3/s. The river is 50 m above surface of a lake. Determine the maximum power generation potential of the river at that location (units: MW). Ignore frictional losses and turbine efficiency and assume that all of the mechanical energy from the river is used to generate power.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]