Mechanical Engineering - Hydraulic Machines - Discussion
Discussion Forum : Hydraulic Machines - Section 1 (Q.No. 12)
12.
A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)
Discussion:
7 comments Page 1 of 1.
Swapnil salave said:
3 years ago
Explain the answer in detail, please.
Md Nabi Hussain said:
5 years ago
The Correct answer is option : A.
Here relative velocity is (V+u) not ( V-u), because they have opposite directions. When a particle with velocity 'u' strike another particle which move with velocity 'V' in the direction of motion (i.e. in the same direction) then relative velocity is (V-u).
But in case of jet propulsion engines, jet and ship have opposite directions so here relative velocity is (V+u).
Here relative velocity is (V+u) not ( V-u), because they have opposite directions. When a particle with velocity 'u' strike another particle which move with velocity 'V' in the direction of motion (i.e. in the same direction) then relative velocity is (V-u).
But in case of jet propulsion engines, jet and ship have opposite directions so here relative velocity is (V+u).
Sudheer said:
5 years ago
Please explain this problem.
Dyuman said:
7 years ago
Mass Flow Rate of water = waVr/g.
Change in jet velocity = Vr-v.
Propulsive Force = Mass flow rate x Change in jet velocity = waVr/g x Vr-v => (Option B).
Change in jet velocity = Vr-v.
Propulsive Force = Mass flow rate x Change in jet velocity = waVr/g x Vr-v => (Option B).
Sara said:
7 years ago
Anybody can explain this?
Aditya kumar said:
7 years ago
Please explain this.
Tony said:
8 years ago
Please explain this.
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