# Chapter 6 - Applications of the Integral - 6.2 Setting Up Integrals: Volume, Density, Average Value - Preliminary Questions - Page 296: 4

The velocity depends on the distance $r$ from the center of the tube.

#### Work Step by Step

In reality, the fluid particles do not all travel at the same velocity because of friction. However, for a slowly moving fluid, the flow is laminar. That is, the velocity depends on the distance $r$ from the center of the tube.

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