How Do You Calculate the Energy Conversion Efficiency of a Blower-Nozzle System?

[mgibson]

Homework Statement

The problem asks to find the energy conversion efficiency of a blower-nozzle combination that produces a velocity of 30m/s for air with a density of 1.1kg/mcubed. The nozzle has a diameter of .15m

input power is 1 hp

Homework Equations

given the flow rate = (density)(Area)(velocity)

The Attempt at a Solution

I know how to find the efficiency but do not know how to convert flow rate in (kg/s) to Power units in order to use (power out/power in) formula

Thanks for your help!

 

[Redbelly98]

Can you figure out the volume of air that exits the nozzle in 1 second?

And from that, can you use the velocity, and mass of that volume, to get it's kinetic energy?