HOMEWORK #3

Due Monday Feb 19: 3:30 PM, 2080 Black

1. Water flows through a horizontal pipe which makes a 60 degree bend. The inside diameter of the pipe is constant at 4 inches and the flow rate is 240 cfm. The pressure at the bend entrance and exit is measured to be 30 psia and 24psia respectively. What force (magnitude and direction relative to the flow inlet direction) is required to hold the bend in place?
   This is the same as Homework #1, except that the change in flow direction is 60 degrees instead of 180 degrees.
2. The pressure altimeter on a low-speed aircraft reads 5000 ft (i.e., it is flying at a pressure altitiude of 5000 ft). The outside air temperature is 45 degrees F. A pitot tube (measuring stagnation pressure) is mounted on the wingtip and it measures an absolute pressure of 12.5 psia.
   Determine
   1. the aircraft true airspeed
   2. its equivalent airspeed
   3. If a pitot-static probe had been used, connected to a water-filled manometer, what would be the measurement in inches of water

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