Itoero Posted March 24, 2018 Share Posted March 24, 2018 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... Link to comment Share on other sites More sharing options...
Strange Posted March 24, 2018 Share Posted March 24, 2018 Orbital velocity: https://en.m.wikipedia.org/wiki/Orbital_speed 1 Link to comment Share on other sites More sharing options...
Sensei Posted March 24, 2018 Share Posted March 24, 2018 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.. Link to comment Share on other sites More sharing options...
Strange Posted March 24, 2018 Share Posted March 24, 2018 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 Link to comment Share on other sites More sharing options...
Itoero Posted March 24, 2018 Author Share Posted March 24, 2018 2 hours ago, Strange said: Orbital velocity: https://en.m.wikipedia.org/wiki/Orbital_speed thx, that explains things. Link to comment Share on other sites More sharing options...
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