Quote (card_sultan @ Jul 13 2016 03:17pm)
Explain how the earth spins at 1000 mph , revolves around the sun at 66.600 mph, goes around the galaxy at 450,000 mph ...but a plane doesn't need to account for that force no matter which direction it moves in
I already did:
Quote (Azrad @ Jul 5 2016 02:11pm)
The problem with the above is these are velocities or speeds, which you are comparing to acceleration (gravity). To compare them we need to calculate the accelerations produced by these rotations:
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Earth's rotational velocity at equator: 1000 mph, in si units that is about 450 m/s.
centripetal acceleration: v^2/r
centripetal acceleration on Earth do to its rotation: {450 (m/s)}^2/{6,400,000 m}≈ 0.03 m/s^2, that is about 0.3% or about 1/300th of the acceleration produced by gravity (Earth to surface of Earth).
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Earth's orbital velocity (sun): 66,600mph -> 30,000 m/s
centripetal acceleration on Earth do to its orbit of sun: {30,000 m/s}^2/{1.5*10^11 m} ≈ 0.006 m/s^2, about 0.06% of the acceleration produced by gravity (Earth to surface of Earth)
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Earth's orbital velocity (around galactic core): 450,000 mph - > 230,000 m/s (I think the actual rate is a bit larger, but this is in the right ballpark).
centripetal acceleration on Earth do to its galactic orbit: {230,000 m/s}^2/{2.5 * 10^20 m} ≈2*10^(-10) m/s^2, a ridiculously small number.
That is why you don't have to account for those accelerations when you are flying a plane, that are so tiny it is extremely difficult to even detect them.
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