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**Venturi meter help!!!**

**1. Homework Statement**

A venturi meter is measuring the flow of water; it has a main diameter of 3.0 cm tapering down to a throat diameter of 1.0 cm. If the pressure difference is measured to be 16 mmHg, what is the speed of the water entering the venturi throat?

**2. Homework Equations**

Got that equation from a previous part of the problem where it asked me to "Show that the flow speed measured by a venturi meter (see Figure 13–32 in the textbook) is given by the relation"

**3. The Attempt at a Solution**

I used [tex]\rho[/tex] to be density of water. I converted the diameters to radius in meters. I converted the pressure to "m-Hg". I get 1.77*10^-5. The homework program keeps telling me I'm wrong. I can't see what I'm doing wrong. Thank You for the help!