# At what speed is the water in the hose moving?

1. Nov 28, 2007

### Jtappan

1. The problem statement, all variables and given/known data

A nozzle of inner radius 1.03 mm is connected to a hose of inner radius 7.97 mm. The nozzle shoots out water moving at 25.5 m/s.
(a) At what speed is the water in the hose moving?
42.589 cm/s
(b) What is the volume flow rate?
84.989 cm3/s
(c) What is the mass flow rate?
_____g/s

2. Relevant equations

3. The attempt at a solution

I have found the speed of the water and the volume flow rate. I do not know how to find the mass flow rate though. Can anyone help me?

2. Nov 28, 2007

### Dick

Mass flow rate and volume flow rate are connected by the density of water, right? Since that is mass/volume.

3. Nov 28, 2007

### BlackWyvern

Part of Bernoulli's Principle is that the mass that leaves the pipe, must be the same as the mass that enters the pipe.

4. Nov 28, 2007

### Jtappan

I am still confused on how to find this though. do i just multiply by Rho of water?

5. Nov 28, 2007

### Jtappan

I cant get this one either...i know they are connected by the density but i dont know what to do with the density

6. Nov 28, 2007

### stewartcs

Mass flow rate = Volumetric flow rate times the fluid's density.

Volumetric flow rate = fluid velocity times the cross-sectional area.

7. Nov 28, 2007

### Jtappan

ahh i just was not converting right thanks for the help!