A pressure washer or power washer is a machine commonly used to clean mildew and

Question

A pressure washer or power washer is a machine commonly used to clean mildew and dirt off houses, driveways, sidewalks etc. It attaches to a common garden hose, pumps pressure of water up, and lets it flow through a small nozzle at the end of a wand. The force of the resulting water jet physically knocks the mildew off. Estimate the maximum force (lbs.) that a water jet from a powerwaher can make on a glass window. Assume the water jet flows from the nozzle at a velocity of 40 ft/s. Also assume the jet is round with a diameter of 0.25 in. (Please show work)

Explanation / Answer

the force in lbs; =(change in momentum)/time; =(density*volume*velocity)/time density=62.4 pounds per cubic foot. volume/time=area*velocity=(3.14*0.25^2/4(in inches))*(40ft) =(0.00408854166667*40); =0.163541; force=0.163541*40*62.4=408.199pounds

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