Question

In a water pistol, a piston drives water through a larger tube of radius 1.41 cm into a smaller tube of radius 1.26 mm.

Answer 1

So basically, you have a conservation of fluid flow that relates the speed of the water and cross sectional area of the water to itself at different points.

You experience this every time you stick your thumb over a water faucet. Try it, it's super fun and should make sense when you do it. Think about it a little.

Ok, so now that that's done, let's see the formula:

\[V_1A_1=V_2A_2\]

You are only given the radius, but you're a big boy and should know how to find area from radius right? So you can find out the relative speed of the water gun is squirting out based on how fast it's going in.