Assuming a constant flow, what will happen to a fluid if the cross-sectional area of the tube in which its flows decrease?
a. Its velocity will increase.
b. Its velocity will decrease.
c. Its density will decrease.
d. Its viscosity will decrease.
ANS: B
Throughout the tube, the fluid flows at a constant rate of 5 L/min. At point A, with a cross-sectional area of 5.08 cm2, the velocity of the fluid is 16.4 cm/sec. At point B, the cross-sectional area of the tube decreases to 2.54 cm2, half its prior value. At this point, the ve-locity of the fluid doubles to 32.8 cm/sec.
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