when an helium filled balloon rises (in a windless scenario) it would just rise straight up, 90°, right? So I know it has the same speed as the spot on earth it was let go. But with anything spinning, it spins faster the further you get away from the center! So how does it pick up speed to stay over the same spot it has left the earth? From where does it get the force to spin faster? Or if it does not need it – why?
In: Earth Science
A hot air balloon floats immersed in the air, similar to the way a fish might float immersed in the ocean. The fish doesn’t see the seafloor below it zoom off at 1000 miles per hour because it is inside the ocean which is rotating with the Earth. Similarly, a hot air balloon rests inside the atmosphere which is rotating with the Earth. The ocean and the atmosphere both rotate with the Earth for the same reason: friction with the solid Earth would prevent them both from moving (on average) across the surface.
Explanation Here:
https://physics.stackexchange.com/questions/525002/why-does-hot-air-balloon-rotate-with-the-earth
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