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05/23/10(Sun)17:53:15 No.230898XXX File1274651595.png-(23
KB, 300x117, science_it_works.png)
Well the plane moves itself
relative to the air, ok? so at that power setting if it has a 100 mph
wind blowing against it it'll hover and stay still relative to the
ground, if there's no wind it'll fly at 100 mph, and if it has a 100 mph
wind blowing with it from behind it'll fly at 200 mph relative to the
ground.
So outside the train it's using its engine at a high
enough power setting to fly itself at 100 miles an hour relative to air
that isn't moving relative to the ground (cos we'll presume there's no
wind to keep things simple). If it were to go into the train carriage,
it would find itself in a pocket of air that was being carried at 100
mph relative to the ground (because it's inside the carriage and the
carriage is moving it). The plane's engine is working so that it moves
the plane at 100 mph relative to whatever air it's in, so as soon as it
gets inside the carriage, into the pocket of air that's moving at 100
mph relative to the ground, it'll start moving at 100 mph relative to
THAT air INSIDE the carriage, thus moving at 200 mph relative to the
ground, and crashing into the wall of the carriage at 100 mph (relative
to the floor of the carriage) |