STANDARDPhysics-Fluid Mechanics
STANDARD Physics Impact of Jet MCQ Question
Type: MCQ-numerical-Medium
A steam of water flowing horizontally with a speed of 25 m s⁻¹ gushes out of a tube of cross-sectional area 10⁻³ m², and hits at a vertical wall nearby. What is the force exerted on the wall by the impact of water?
A
125 N
B
−650 N
C
625 N
D
−1125 N
Correct Answer
Option C
Detailed Explanation
The mass of water gushed out per second is m = Avρ = 10⁻³ × 25 × 1000 = 25 kg. The force exerted on the wall is F = ma = 25 × 25 = 625 N. The negative sign indicates the direction of force opposite to the flow.
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