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Consider the two situations in the picture. Air at constant velocity enters the duct from the left, and the duct is connected to a thin

Consider the two situations in the picture. Air at constant velocity enters the duct from the left, and the duct is connected to  a thin oil-filled tube. Which of the two pictures are correct considering the oil levels? Next, imagine that the air enters from the right instead, what would be the correct picture in this case?

 

Flow Flow (a) (b)

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