APFIVE Fluid Flow and the Continuity Equation
A horizontal pipe has a constriction where its cross-sectional area decreases to half its original value. If the fluid is incompressible and the initial speed is v, which physical quantity must double at the constriction?
A
Time for a fluid element to travel a fixed distance
B
Fluid density
C
Fluid speed
D
Mass of fluid per unit length
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