The linear momentum equation for a control volume relates the resultant external force to the:
Correct answer: B. Rate of change of momentum flux
- A. Rate of change of pressure head
- B. Rate of change of momentum flux
- C. Total loss of mechanical energy
- D. Rate of change of fluid viscosity
Explanation
The momentum principle states that the resultant external force equals the rate of change of momentum of the fluid system. In control-volume analysis, this is expressed using momentum flux entering and leaving the control volume.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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