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A jet-propelled boat discharges water through a jet of area 200 cm²; the water being drawn form inlet openings facing the direction of motion. The total drag is estimated to be 17-66 u N where u is the speed of the boat in m/s. If the boat moves at 54 km/h, determine: (i) Relative velocity of jet, (ii) Energy supplied by the jet, (iii) Power of motor required to work the pumps, and (iv) Efficiency of propulsion. Assume: Efficiency of pump-set = 75 per cent, and density of water = 1020 kg/m³. [Ans. (i) 23.34 m/s; (ii) 76125 Nm/s; (iii) 101.4 kW; (iv) 78.2%]

A jet-propelled boat discharges water through a jet of area 200 cm²; the water being drawn form inlet openings facing the direction of motion. The total drag is estimated to be 17-66 u N where u is the speed of the boat in m/s. If the boat moves at 54 km/h, determine: (i) Relative velocity of jet, (ii) Energy supplied by the jet, (iii) Power of motor required to work the pumps, and (iv) Efficiency of propulsion. Assume: Efficiency of pump-set = 75 per cent, and density of water = 1020 kg/m³. [Ans. (i) 23.34 m/s; (ii) 76125 Nm/s; (iii) 101.4 kW; (iv) 78.2%]

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A jet-propelled boat discharges water through a jet of area 200 cm“; the water being drawn form inlet openings facing the direction of motion. The total drag is estimated to be 17-66 u N where u is the speed of the boat in m/s. If the boat moves at 54 km/h, determine: (i) Relative velocity of jet, (ii) Energy supplied by the jet, (iii) Power of motor required to work the pumps, and (iv) Efficiency of propulsion. Assume: Efficiency of pump-set = 75 per cent, and density of water = 1020 kg/m³. [Ans. (i) 23.34 m/s; (ii) 76125 Nm/s; (iii) 101.4 kW; (iv) 78.2%]
Transcribed Image Text:A jet-propelled boat discharges water through a jet of area 200 cm“; the water being drawn form inlet openings facing the direction of motion. The total drag is estimated to be 17-66 u N where u is the speed of the boat in m/s. If the boat moves at 54 km/h, determine: (i) Relative velocity of jet, (ii) Energy supplied by the jet, (iii) Power of motor required to work the pumps, and (iv) Efficiency of propulsion. Assume: Efficiency of pump-set = 75 per cent, and density of water = 1020 kg/m³. [Ans. (i) 23.34 m/s; (ii) 76125 Nm/s; (iii) 101.4 kW; (iv) 78.2%]
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