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Mass Flow Rate

  1. Nov 28, 2007 #1
    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?

    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. jcsd
  3. Nov 28, 2007 #2


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    Mass flow rate and volume flow rate are connected by the density of water, right? Since that is mass/volume.
  4. Nov 28, 2007 #3
    Part of Bernoulli's Principle is that the mass that leaves the pipe, must be the same as the mass that enters the pipe.
  5. Nov 28, 2007 #4
    I am still confused on how to find this though. do i just multiply by Rho of water?
  6. Nov 28, 2007 #5
    I cant get this one either...i know they are connected by the density but i dont know what to do with the density
  7. Nov 28, 2007 #6


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

    Volumetric flow rate = fluid velocity times the cross-sectional area.
  8. Nov 28, 2007 #7
    ahh i just was not converting right thanks for the help!
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