Mass flow rate is
Correct answer: C. ρAV
- A. AVt
- B. AV
- C. ρAV
- D. ρAVt
Explanation
The mass flow rate is defined as the mass of fluid passing through a cross-sectional area per unit time. The correct expression is ρAV, where:ρ (rho) is the fluid density, which accounts for the mass per unit volume.A is the cross-sectional area through which the fluid flows.V is the velocity of the fluid.Option A (AVt) includes time, which would give the total volume over time, not a rate. Option B (AV) lacks the density and thus only gives the volumetric flow rate. Option D (ρAVt) introduces time, leading to the total mass, not a rate.
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About Fluid Dynamics
Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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