Question: The scientists decided to launch their ship into the Marianas Trench. What is the advantage of launching there?
Question: The heroes manage to get the core spinning again by detonating 5 200 megaton nuclear bombs. In real life, wouldn't it take hundreds of 200 nuclear bombs to get the core spinning again?
Answer: No number of nuclear weapons would have an effect on the movement of the Earth's core. The bombs in the movie are just there as part of the plot. The Core is a hysterically unscientific movie. It's still great fun though.
Question: If the core stopped spinning, where would all the kinetic energy that keeps it spinning go? Energy cannot be created or destroyed.
Answer: For one thing, the rotation of the core is almost identical to (if not a bit faster than) the rotation of the rest of the planet; so the core coming to a stop relative to the rest of the planet is physically impossible. Over billions of more years, the Earth's core and mantle may eventually cool off and solidify (as has happened on Mars), but the core will still be rotating at the same velocity as the rest of the planet. By that time, of course, Earth will have also lost its Moon, so there will be no tidal forces between the Earth and Moon, which means the planet will be seismically dead, but the Earth will still be rotating on its axis. For the time being, though, it would literally take a miracle, an act of divine intervention, to overcome the physics of planetary rotation. If the core could somehow be stopped relative to the rest of the planet (which is physically impossible), then the core's energy would quite quickly be dissipated into the Earth's mantle, which would become an unimaginable inferno (much more so than it already is), propagating seismic and super-volcano activity all over the globe by a factor of, say, 10,000 times normal activity. The Earth's crust would be effectively ripped to shreds by super-earthquakes and eruptions within a matter of hours, perhaps even causing the entire globe to disintegrate into space. As mentioned, though, it would require something on the order of a true miracle to precipitate this chain of events.
Answer: The same place it goes normally: dissipated into the Earth.
Answer: The Marianas Trench is the deepest point on the Earth, so there would be less solid rock and molten material to bore through, making it a shorter, faster route to the core.
raywest ★