hello........friends..........
plz help me....
I want some important science quiz types questions of my level (7th class).
plz answer it
Answers
3.) Using our knowledge of the relationship between density and buoyancy we can explain how a submarine is able to float, sink and re-surface. Which of the following statements best describes how a submarine can re-surface?
A.
Re-surfacing: Compressed air is forced into the ballast tanks through valves at the top. The pressure of the water inside the ballast tanks is less than the pressure in the ocean therefore it is forced out. The density of the submarine with air in the tanks is less than the density of the water, so the submarine rises to the surface.
B.
Re-surfacing: Compressed air is forced into the ballast tanks through valves at the top. The pressure of the water inside the ballast tanks is greater than the pressure in the ocean therefore it is forced out. The density of the submarine with air in the tanks is greater than the density of the water, so the submarine rises to the surface.
C.
Re-surfacing: Compressed air is forced into the ballast tanks through valves at the top. The pressure of the water inside the ballast tanks is greater than the pressure in the ocean therefore it is forced out. The density of the submarine with air in the tanks is less than the density of the water, so the submarine rises to the surface.
is the answer a, b, or c?