5- A river barge which is 50 m long and 12 m wide has flat bottom; therefore, its resistance is similar to one side of a flat plate. If the barge is towed at speed of 3 m/s through still water, what towing force is required to overcome viscous resistance and what is the boundary layer thickness at mid length? ASsume the boundary layer is turbulent for the entire length. (p = 1000 kg/m; v= 1.21×10-6 m2/s) [5.57 kN ; 0.26 m] %3D

5- A river barge which is 50 m long and 12 m wide has flat bottom; therefore, its resistance is similar to one side of a flat plate. If the barge is towed at speed of 3 m/s through still water, what towing force is required to overcome viscous resistance and what is the boundary layer thickness at mid length? ASsume the boundary layer is turbulent for the entire length. (p = 1000 kg/m; v= 1.21×10-6 m2/s) [5.57 kN ; 0.26 m] %3D

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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5- A river barge which is 50 m long and 12 m wide has flat bottom; therefore, its resistance is similar to one side of a flat plate. If the barge is towed at speed of 3 m/s through still water, what towing force is required to overcome viscous resistance and what is the boundary layer thickness at mid length? Assume the boundary layer is turbulent for the entire length. (p = 1000 kg/m ; v = 1.21×106 m²/s) [5.57 kN ; 0.26 m]
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A ship is 150 m long and has a wetted area of 5000 m2.If it is encrusted with barnacles, the ship requires 7000 hpto overcome friction drag when moving in seawater at 15 kn and 20°C. What is the average roughness of thebarnacles? How fast would the ship move with the samepower if the surface were smooth? Neglect wave drag.