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individual endeavor
It is not explosive alone, but with other materials it can become explosive.
I don't really think that is a defined fear....
NO
No.
using the light alone to measure the weight of a unknown object is impossible.
No, because you can predict if an object will sink or float mostly on density.
It is an object that receives the action of the verb.
of course not a design is a stand alone entity. You can design anything like a house but you do not have to build it. So unless you consider the pencil a tool or the paper a tool (which they are) then the answer is yes the tools were used to construct the design.
No. An object will sink if its DENSITY is greater than that of the liquid (or gas) in which you place it.
no detail on the fly, as (depending on the design) an astronomical telescope has trouble focusing any closer than about 8 metres, let alone an object actually on the objective lens. I imagine the view would be tarnished by a black smudge in the Field of view.
In free fall, the force of gravity alone causes an object to accelerate in the downward direction.