Similitude Water flows through a 5 inch diameter pipe at 10 ft/s. If a test is performed using mercury moving at 4 ft/s, what diameter pipe (in inches) would be needed to maintain the same dynamic...

Extracted text: Similitude Water flows through a 5 inch diameter pipe at 10 ft/s. If a test is performed using mercury moving at 4 ft/s, what diameter pipe (in inches) would be needed to maintain the same dynamic characteristics? Both fluids are at standard temperature and pressure. Hint: What dimensionless number do we use all the time for pipes?