Quote:
Originally Posted by The Star
Energy can be converted into matter or other forms of energy but can not be produced.a machine can not produce energy without consuming matter or any other form of energy,it only converts one form into another.This is a well established and well known fact of mechanics.so the answer should be no.
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The question focuses on a machine which can go on working
without the expenditure of energy...
Scientists have already created a proto-type aircraft which uses solar energy, and it is assumed the aircraft could fly forever by charging its solar cells from sun light. Therefore the answer is YES.