How fast does a drone has to fly so the gravity  of the earth keeps it flying without the need of extra force? It flies 3m high with a weight of 0,5kg and its course is free of physical drag. There is only the gravitational field of the Earth. Mass of earth is about 5.9722 x 10²⁴ kg.

I don't know if this is a brain teaser or just a ' simple' equation...

Orbital velocity: https://en.m.wikipedia.org/wiki/Orbital_speed

 

35 minutes ago, Itoero said:

How fast does a drone has to fly so the gravity  of the earth keeps it flying without the need of extra force? It flies 3m high with a weight of 0,5kg and its course is free of physical drag. There is only the gravitational field of the Earth. Mass of earth is about 5.9722 x 10²⁴ kg.

I don't know if this is a brain teaser or just a ' simple' equation...

The Earth atmosphere gas molecules mostly N₂ and O₂ will decelerate any object... so keeping constant speed is not sufficient at low altitude..

This can be thought experiment when there is no atmosphere around cosmic object..

 

 

2 minutes ago, Sensei said:

The Earth atmosphere gas molecules mostly N₂ and O₂ will decelerate any object...

Did you miss this bit:

40 minutes ago, Itoero said:

free of physical drag

 

2 hours ago, Strange said:

Orbital velocity: https://en.m.wikipedia.org/wiki/Orbital_speed

 

thx, that explains things.