So if a Hot Air Balloon lifts off on a nil wind day and lands back say after an hour... It wouldn't land on the same spot where it got airborne from ....??
Yeh, it would apart from the odd draft. Why? Because the air in which the balloon is floating is in itself stuck to the Earth by gravity and therefore moves with it, the Earth rotates, the air is stuck to it, the ballon is in the air.
Job done.
Plus free gift!
Also, if there were no air, and you did the balloon trick, apart from it would not float, (or would it - thats another thing) so no air then . . . . . . It, the ballon, is travelling at the same speed as the . . . planet it is sitting on . . right? Yes it is.
Sooooo, if the surface of the planet is rotating at 900 kts/hr then said balloon is also travelling at the same speed, therefore same speed of the surface going up to altitude and same speed at the surface descending back down again. Not relative just p
s easy.
Actually, balloon would blow up pretty fantastically, if there were no air . ..