A Glass Tube Has Several Different Cross-Sectional Areas with the Values

A glass tube has several different cross-sectional areas with the values indicated in the figure.A piston at the left end of the tube exerts pressure so that mercury within the tube flows from the right end with a speed of 8.0 m/s.Three points within the tube are labeled A,B,and C.
Notes: The drawing is not drawn to scale.
Atmospheric pressure is 1.01 × 10⁵ N/m²;and the density of mercury is 13 600 kg/m³.
-At what speed is mercury flowing past the point labeled B?

A) 2.27 m/s
B) 4.27 m/s
C) 7.47 m/s
D) 8.57 m/s
E) 9.28 m/s

Correct Answer:

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