QUESTION 7 "Consider water flow through a horizontal, short pipe at a rate of 83 kg/min. The velocity at the inlet is 1.1 m/s and that at the outlet is 16.5 m/s. The pipe makes a 90 turn to a vertical direction before the water is discharged. Disregard the weight of the pipe and water. Taking the momentum-flux correction factor to be 1.06 at both the inlet and the outlet, the reaction force (in N; hint: the answer is a negative number) in the horizontal direction required to hold the pipe in place is ?" QUESTION 8 "The velocity of wind at a wind turbine is measured to be 8 m/s. The blade span diameter is 12 m. The density of air is 1.4 kg/m3. If the horizontal force exerted by the wind on the supporting mast of the wind turbine is 1630 N, the efficiency (expressed in decimals) of the wind turbine is