Question

Water flows through a 3.40 cm diameter hose at 1.20×10−4 m3/s .what is the flow speed

Answer 1

The flow rate is defined as the volume of fluid passing through the area per unit of time.
$Q=\frac{dV}{dt}=\frac{Adl}{dt}=A\frac{dl}{dt}=Av$
Where A is the surface is the surface area, l is the length of a cylinder, and v is speed flow.
If we solve the equation for speed flow we get:
$v=\frac{Q}{A}$
$v=\frac{Q}{ \pi r^2}$
When we plug in the numbers we get:
$v=0.033\frac{m}{s}$