In a fire fighting machine, a jet is attached to the head of water pipes to increase the
Correct answer: C. Velocity of water flowing out of it.
- A. Mass of water flowing out of it.
- B. Volume of water flowing out of it.
- C. Velocity of water flowing out of it.
- D. Distance covered by water flowing out of it.
Explanation
The correct answer is Option C: The jet is designed to increase the velocity of water flowing out of it. By constricting the flow path, the jet causes the water to exit at a higher speed, which is essential for reaching greater distances and effectively fighting fires. Option A is incorrect because the mass of water is determined by the source and does not change with the use of a jet. Option B is incorrect as the volume of water is determined by the supply, not by the jet. Option D is partly correct in that the distance can be increased, but this is a result of increased velocity, which is why Option C is the more direct and accurate answer.
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About Equation of Continuity
The equation of continuity expresses conservation of mass in fluid flow. For steady incompressible flow, Av remains constant, so fluid speed increases when the cross-sectional area decreases; for compressible flow, ρAv is constant. This relation describes flow rate and area-speed changes without including pressure effects from Bernoulli’s equation.
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