Question

4) The rotating arm at the bottom of a dishwasher is shown in the diagram below. The jets exit perpendicularly to the arm in the plane of its rotation but

are inclined by an angle of 60 degrees with respect to this plane. All jets have a diameter of 4" and the total flow rate through the arm is 6 gallons per minute of 160 °F water. Assuming the flow rate divides evenly between all jets, and there is no friction in the bearings, what is the maximum RPM of the dishwasher arm?

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