Final answer:
The question addresses fluid dynamics and the principles of fluid flow, specifically the conservation of mass in a parallel-pipe system and the viscosity properties of SAE 50W oil in the context of physics.
Step-by-step explanation:
The question concerns the flow of SAE 50W oil through a parallel-pipe system, which is a topic related to the properties of liquids and fluid dynamics in physics. The flow rate is given for two different sections of pipe, with oil moving faster through the smaller section (5.7 m/s) compared to the larger section (1.8 m/s), yet the mass flow rate is consistent between both sections (380 kg/s), illustrating the principle of mass conservation. Furthermore, the viscosity of motor oils, including SAE 50W, is influenced by temperature, as oils like SAE 20W/50 behave like an SAE 20 at low temperatures and SAE 50 at high temperatures.