Question: In Figure Q14.31, an air stream moves from right to left through a tube that is constricted at the middle. Three Ping-Pong balls are levitated

In Figure Q14.31, an air stream moves from right to left through a tube that is constricted at the middle. Three Ping-Pong balls are levitated in equilibrium above the vertical columns through which the air escapes.
(a) Why is the ball at the right higher than the one in the middle?
(b) Why is the ball at the left lower than the ball at the right even though the horizontal tube has the same dimensions at these two points?

In Figure Q14.31, an air stream moves from right to

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