Some energy will always be lost due to different factors such as friction.
Almost certainly not. Timelike geodesics (aka a "time machine") are theoretically possible if you can construct an infinitely long pair of rotating cylinders.Don't hold your breath waiting.
not possible
He did not construct a flying machine though he did draw one
Steel.
Yes, it is possible.
No, it is an ambiguous case: there are two possible configurations.
The foundation of machines is a civil work.Civil engineer design the civil work to be construct according to the machine being installed on that foundation.For example in a Grid station we have to construct a foundation for Power Transformer so that mechanical forces may be suppressed by this.
It is possible, but the answer depends on the interlocking shapes and the sizes of the pieces.
Yes.
No
yes
No, it is not possible to construct a cube of twice teh volume of a given cube using only a straightedge and a compass.