![]() It is important to note that we cannot derive a general expression for Newton's second law for variable mass systems by treating the mass in F = d P/ dt = d( M v) as a variable. ^ Essential Principles of Physics, P.M.Chemical Engineering Reference Manual for the PE Exam. ^ "Mass Flow Rate Fluids Flow Equation - Engineers Edge". ![]() In electricity, the rate of flow of charge is electric current. ![]() In hydrodynamics, mass flow rate is the rate of flow of mass. The common symbol is m ˙ = unit mass energy of a systemĮnergy flow rate has SI units of kilojoule per second or kilowatt. Its unit is kilogram per second in SI units, and slug per second or pound per second in US customary units. In physics and engineering, mass flow rate is the mass of a substance which passes per unit of time.
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