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Q. a light airplane is headed due south with a speed of 159 km/h. after 1.09 hour the plane has traveled 123 km their direction is 45 degrees. What is the wind velocity?

Q. The drawing shows a mercury barometer. Consider two barometers, one using mercury and another using an unknown liquid. Suppose that the pressure above the liquid in each tube is negligible. The height of the unknown liquid is 18.3 times greater than the height of the mercury. Find the density of the unknown liquid.

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