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Re: one question

>> > > Yes, in fact is does not take any energy to keep floating a few metres
>> > > Earth's surface.
>> >Well, it depends on how you make the object float.

>> No, if you for example use a helicopter, it does not take energy to stay
>> that height but it does take energy to move all the air.

>> Timothy

Hold your arm out to you side.  Tell me it takes no effort (energy) to hold
it there.