When the submarine is on the surface, its ballast tanks are filled with air. As the submarine dives, the ballast tanks are flooded with water and the air in the ballast tanks is vented from the submarine. The submarine descends from sea level and holds at a constant depth of 3,500m. Background Information Submarine Volume is 450 m3 Mass (excluding weight in ballast tank) is 400 tons Outer haul Mass is 40 tons Thickness is 15 cm Exterior surface area is 200 m2 Specific heat capacity is 420 J/kg/K Latent heat of fusion is 250 kJ/kg Temperature at surface (depth of 0 m) is 25°C depth of 3,500 m internal of the outer haul (next to ballast tank) is 10 30°C (Refer to diagram) external of the outer haul is 10°C (Refer to diagram) Thermal conductivity is 80 kW/m/K Emissivity of 0.9 Ballast Tank at a depth of 3,500 m Temperature at is 30°C Seawater Specific gravity of 1.05 Surrounding temperature at a depth of 3,500 m is 4°C Convective heat transfer coefficient for free convection is 75 W/m2/K Question Describe the forces that enable the submarine to descend or ascend in the seawater. When the submarine holds at the constant depth of 3,500m, calculate the buoyant force on the submarine. weight of seawater in the ballast tank. seawater pressure. 3. When seawater flows into the bottom opening at 10 m/s, calculate the velocity of the seawater level (8m above the bottom of the submarine) inside the ballast tank (v on diagram). 4. Calculate the net force on the submarine circular hatch door (10m above the bottom of the submarine) with a radius of 0.5m. The air pressure inside the submarine below the hatch door is 150 101.3 kPa. 5. Calculate the change in heat energy of the submarine’s outer haul, when it descends from the surface to a depth of 3,500m (with an average temperature of 20°C). 6. Calculate the power of the submarine’s electrical heater needed, to maintain the interior of outer hull at 30°C. The exterior of outer hull is 10°C. (Assume heat of the submarine is only lost across the outer hull) 7. Suggest aerospace applications of ballast.

When the submarine is on the surface, its ballast tanks are filled with air. As the submarine dives, the ballast tanks are flooded with water and the air in the ballast tanks is vented from the submarine. The submarine descends from sea level and holds at a constant depth of 3,500m. Background Information Submarine Volume is 450 m3 Mass (excluding weight in ballast tank) is 400 tons Outer haul Mass is 40 tons Thickness is 15 cm Exterior surface area is 200 m2 Specific heat capacity is 420 J/kg/K Latent heat of fusion is 250 kJ/kg Temperature at surface (depth of 0 m) is 25°C depth of 3,500 m internal of the outer haul (next to ballast tank) is 10 30°C (Refer to diagram) external of the outer haul is 10°C (Refer to diagram) Thermal conductivity is 80 kW/m/K Emissivity of 0.9 Ballast Tank at a depth of 3,500 m Temperature at is 30°C Seawater Specific gravity of 1.05 Surrounding temperature at a depth of 3,500 m is 4°C Convective heat transfer coefficient for free convection is 75 W/m2/K Question Describe the forces that enable the submarine to descend or ascend in the seawater. When the submarine holds at the constant depth of 3,500m, calculate the buoyant force on the submarine. weight of seawater in the ballast tank. seawater pressure. 3. When seawater flows into the bottom opening at 10 m/s, calculate the velocity of the seawater level (8m above the bottom of the submarine) inside the ballast tank (v on diagram). 4. Calculate the net force on the submarine circular hatch door (10m above the bottom of the submarine) with a radius of 0.5m. The air pressure inside the submarine below the hatch door is 150 101.3 kPa. 5. Calculate the change in heat energy of the submarine’s outer haul, when it descends from the surface to a depth of 3,500m (with an average temperature of 20°C). 6. Calculate the power of the submarine’s electrical heater needed, to maintain the interior of outer hull at 30°C. The exterior of outer hull is 10°C. (Assume heat of the submarine is only lost across the outer hull) 7. Suggest aerospace applications of ballast.

Name: When the submarine is on the surface, its ballast tanks are filled wit
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Description: When the submarine is on the surface, its ballast tanks are filled with air. As the submarine dives, the ballast tanks are flooded with water and the air in the ballast tanks is vented from the submarine. The submarine descends from sea level and hol

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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Background Information

Submarine

Volume is 450 m3
Mass (excluding weight in ballast tank) is 400 tons
Outer haul

Mass is 40 tons
Thickness is 15 cm
Exterior surface area is 200 m2
Specific heat capacity is 420 J/kg/K
Latent heat of fusion is 250 kJ/kg
Temperature at

surface (depth of 0 m) is 25°C
depth of 3,500 m

internal of the outer haul (next to ballast tank) is 10 30°C (Refer to diagram)
external of the outer haul is 10°C (Refer to diagram)

Thermal conductivity is 80 kW/m/K
Emissivity of 0.9

Ballast Tank at a depth of 3,500 m

Temperature at is 30°C

Seawater

Specific gravity of 1.05
Surrounding temperature at a depth of 3,500 m is 4°C
Convective heat transfer coefficient for free convection is 75 W/m2/K

Question

Describe the forces that enable the submarine to descend or ascend in the seawater.
When the submarine holds at the constant depth of 3,500m, calculate the

buoyant force on the submarine.
weight of seawater in the ballast tank.
seawater pressure.

3. When seawater flows into the bottom opening at 10 m/s, calculate the velocity of the seawater level (8m above the bottom of the submarine) inside the ballast tank (v on diagram).

4. Calculate the net force on the submarine circular hatch door (10m above the bottom of the submarine) with a radius of 0.5m. The air pressure inside the submarine below the hatch door is 150 101.3 kPa.

5. Calculate the change in heat energy of the submarine’s outer haul, when it descends from the surface to a depth of 3,500m (with an average temperature of 20°C).

6. Calculate the power of the submarine’s electrical heater needed, to maintain the interior of outer hull at 30°C. The exterior of outer hull is 10°C. (Assume heat of the submarine is only lost across the outer hull)

7. Suggest aerospace applications of ballast.

Air
Tank
Opening
Vent
Outer hull
Inner hull
Ballast tank

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Can u continue the question 5 to 7

5. Calculate the change in heat energy of the submarine’s outer haul, when it descends from the surface to a depth of 3,500m (with an average temperature of 20°C).

7. Suggest aerospace applications of ballast.

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WHEN SEAWATER FLOWS INTO THE BOTTOM OPENING AT 10 M/S, CALCULATE THE VELOCITY OF THE SEAWATER LEVEL (8M ABOVE THE BOTTOM OF THE SUBMARINE) INSIDE THE BALLAST TANK (V ON DIAGRAM).

Depth of
bottom of
submarine
at 3,500 m
Air at 150 kPa
v?
8 m
Air
2
10 m
Tank
Hatch Door
10 m/s Opening
30°C
Air at 101.3 kPa
10°C
4°C
Vent
-Outer hull
Inner hull
Ballast tank...

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