a magnetic compensates for the change, and, at the same time, sounds an alarm so an operator can check to find the reason for the change. If the current drawn by the underwater repeater amplifier tubes begins
The U.S. Navy revoked its ban on women serving in submarines. The last U.S. troops began leaving Iraq, and Obama announced that combat operations in Iraq would be discontinued. [Pictured: President Barack Obama signs the Don't Ask, Don't Tell Repeal Act of 2010] 2011: Osama bin Laden...
Some tunnels omit air entirely and instead use water. Water flows much like air, but it has greater density than air and is more visible, too. Those properties help scientists visualize flow patterns around submarines and ship hulls, or even better see shockwaves created by very fast aircraft...
Why can a submarine hang in water? Explain the physics concept to why a ship sounds when moving in water? How do the mainsail and the jib of a sailboat help the boat sail? What do these two sails have to do with force? How buoyant is wood? Why can't submarines go to the bottom ...
Fast Fact A well-known density-driven current occurs where the saltier Mediterranean Sea empties into the Atlantic Ocean. During World War II, submarines used this current to enter and leave the Mediterranean without even turning on their engines! Tidal Currents The gravitational pull of the moon...
That's why whales use sound to communicate over such long distances and why submarines use SONAR (sound navigation and ranging; a sound-based navigation system similar to radar only using sound waves instead of radio waves). It's also one of the reasons why it's very hard to figure out ...
It’s hard to know what’s going on when you’re underwater. For more than 100 years, submarines have struggled with a lack of situational awareness—the result of being low to the surface of the ocean or underneath it. Now, thanks to the drone revolution, submarines will have access to...
It's fast. It's easy to take with you wherever you go. It's able to completely hide you from any other boats or submarines. It's dependable. It costs little to add additional submarines to your fleet once you've purchased the first one. Although they're traveling in the ocean along...
Most boats move partly through and partly above water but some (notably hovercraft and hydrofoils) lift up and speed over it while others (submarines and submersibles, which are small submarines) go entirely under it. These sound like quite pedantic distinctions, but they turn out to be very ...
Search for MH370 goes underwater 01:51 CNN — Four pings and an oil slick. That’s what the search for Malaysia Airlines Flight 370 has yielded so far. No signs of wreckage, no assurances of exactly where the plane might be. So officials are launching their next option: an ...