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    Can somebody explain me this?

    You all know the idea of helicopters. What happens if the tail of the helicopter is endlessly long? That's the idea I would like You to explain me. What physics rule in this case? Will the back propeller have any resistance to move? Give me please some mathematics.
  2. A

    Can somebody explain me this?

    I took an engine from computer's ventilator and I have moved it along the axis of possible rotation (it was not rotating). Nothing happened. I was moving it along the straight line. When the engine was working and rotating, something weird happened, 'cause the engine did everything not to move...
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