Answer:
I am a bow that can never be tied or broken but can disappear. What am I?
I fill a room but take no space. What am I?
I am the key that is the hardest to turn
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.
You shoot me but I don't die. You hang me but I don't die. What am I?
The more of me you take, the more I appear behind you. What am I?