A submarine can submerge by filling ballast and trimmer tanks with sea water. The additional weight will take the submarine down. To resurface, the submarine will blow the sea water out of the tanks using compressed air. The air in the tanks make the submarine buoyant, so it rises and floats on the surface. Though a stationary submarine can submerge in this way, it usually submerges going forward and using diving plane (fins) to steepen the dive, so getting under the surface faster.
In war a submarine can hide under the water and attack without being seen.
Yes, it can. - Jet engines have no propeller.
B
Where the gun fires through the propeller, the two are mechanically connected and timed so that the rounds will pass between the blades of the propeller.
propulsion makes something move forward,for example;airplanes have propulsion because without propulsion it would not move forward.
as far as i can remember your not supposed to go to the submarine.
There was no submarine that could do that as early as 1945
You get the jetpack if u have it and dance
Do you mean a glider? An aircraft that flies without propulsion? Soaring.
The main form of propulsion for vessels without mechanical means is the wind
Unlikely without some form of external propulsion
The propellor basically propels the aircraft. without it the airplane wouldn't go anywhere.