*062 A pitot tube (Fig. 14-48) is used to determine the airspeed of an airplane. It consists of an outer tube with a number of small holes 

 (four are shown) that allow air into the tube; that tube is connected to one arm of a U-tube. The other arm of the U-tube is connected to hole 

 at the front end of the device, which points in the direction the plane is headed. At 

, however, the speed of the air presumably equals the airspeed 

 of the plane. (b) Suppose that the tube con- tains alcohol and the level difference 

 is 26.0 cm . What is the plane's speed relative to the air? The density of the air is 

14.P.62b

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14.P.62b

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