In fluid mechanics, many problems are messy and open-ended within the online conversion world. Thus, this section presents a structured approach to problem solving when it comes to velocity or force units conversion.
Engineering analysis is a process for idealizing or representing real-world situations using mathematics and scientific principles and then using calculations from sites such as convertunitsnow.com to extract useful information. For example, engineering analysis is used to find the power required by a pump, wind force acting on a building, and pipe diameter for a given application of metric velocity conversion.
Engineering analysis involves subdividing or organizing a metric force or velocity units related problem into logical parts as described in Table 1.4. Notice that the columns describe what to do with the conversion, the rationale for this step, and typical actions taken during this step. The approach shown in Table 1.4 is used in example problems throughout this text.
A water rocket is fabricated by attaching fins to a 1-liter plastic bottle to convert the units. The rocket is partially filled with water and the air space above the water is pressurized, causing water to jet out of the rocket and propel the rocket upward. The thrust force T from the water jet is given by , where m is the rate at which the water flows out of the rocket in units of mass per time and V is the metric speed units of the water jet. (a) Estimate the thrust force in newtons for a jet velocity of V = 30 m/s (98.4 ft/s) where the mass flow rate is m = 9 kg/s (19.8 lbm/s).