What ishydraulic diameter? How is it defined? What is it equal to for a circular tube of diameter D?
What will be an ideal response?
For flow through non-circular tubes, the Reynolds number as well as the Nusselt number and the friction factor are based on the hydraulic diameter Dh defined as 
where Ac is the cross-sectional area of the tube and p is its perimeter. The hydraulic diameter is defined such that it reduces to ordinary diameter D for circular tubes since 
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El concreto de una planta central de mezclado es _____.
a. mezclado casi completa- mente antes de abandonar la planta b. mezclado en la obra de construcción c. mezclado en un camión mezclador después de abandonar la planta d. un tipo de concreto de mezcla seca
A drive control that returns to neutral and locks when released is referred to as a(n) _____.
a. emergency cutout b. safety interlock c. deadman switch d. termination device
What was the impact of the Pacific Railroad Act?
A. The federal government became a major investor in the transcontinental railroad. B. The price of cotton rose as new railroads fueled demand and enhanced Southern power. C. The British moved through the creation of a new fleet to blockage U.S. cotton exports. D. The price of steel rose, fueling economic interdependence with newly free Canada. E. Private lands were seized by the federal government and gifted to the railroads.
Capitalism illustrates the fallacy of composition
Indicate whether the statement is true or false