|MadSci Network: Physics|
Suppose a body of mass M = (say)2 Kg is staying at a distance h= (say)5 mts above earth. Now the potential energy of that body is mgh = 2*10*5 = 100 J (approx). Suppose rocket like thrust is causing that body to stay in the air. Now the amount of rocket fuel it has to burn should be equal to what it should to produce this enery , isnt it ? But to stay in that position for different times different amount of energies has to be burned up (i.e. to stay for 10 hours we have to burn 10 times the energy needed for staying 1 hour). How is this possible ? If someone can explain to me why this happens I would be much obliged.
Re: Shouldnt energy have component which makes it propotional to time involved?
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