I have grasp the concept that escape velocity can be less than 25000 mph. My original problem was with the footnotes assertion that it could be MUCH GREATER than 25000 mph. If that is the surface escape velocity and it is at the surface where the highest escape velocity is required where are the...
I had assumed that the escape velocity and the energy needed to achieve it were separate questions. That of course it would take more energy to lift off from the surface of the Earth than higher in the atmosphere but that the terminal velocity would be the same in both cases. This is apparently...
"The escape velocity depends on where you start your climb" So if you were to start at 10000 Ft. you would have to achieve a lesser velocity than if you started at the surface? If you are in Earth orbit you do not have to achieve 25000 mph?
The book is THE BLACK HOLE WAR by Leonard Susskind. Footnote on page 26 "The escape velocity is an idealization that ignores effects such as air resistance , which would require the object to have a far greater velocity". As I said, I do not understand this. My naive interpretation of Newton is...
I am a historian[ PhD] who specializes in the History of Science and consequently reads a great deal of physics. Since my childhood I have been fascinated by space travel and have always read that the escape velocity from the Earth's gravational field is 25000 mph. I recently read a book in...