HantsUK
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- Oct 27, 2009
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I would never get on a plane that could not change direction!It matters not whether we are considering a projectile or a self-powered object. As pointed out to Bradskii in response to his frame of reference argument, it is the conservation of (in this case) the plane's original tangential (not directional) velocity:
"The frame of reference is not the issue here. Simply put, when the plane departs New York, it departs (i.e., detaches from the solid earth’s surface) with the (west → east) tangential velocity of the allegedly rotating earth at the latitude of New York. Unless the laws of physics have changed, that (west → east) tangential velocity is conserved as the plane flies south. When the plane reaches the latitude of Bogotá, the plane because its (conserved) tangential velocity has not increased with the increasing tangential velocity of the allegedly rotating earth in the direction of the equator, is now at westerly longitude, its location estimated to be somewhere NNW of the Galápagos Islands. There is simply no atmospheric or aerodynamical process that compensates for that increase in tangential velocity. Publicly available flight records indicate the flight (New York and Bogotá being on similar meridians) is due south (i.e., not compensating for the allegedly tangential component). But again, not to worry. No navigation issues here because the earth DOES NOT MOVE."
Planes have engines. Planes have the means to change direction (such as flaps on their wings). Thus there are forces acting on the plane that will change its velocity (which includes direction).
So, yes, it does matter that a plane is self-powered and can steer.
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