The eqivalence principle is a principle that replaces the actual source i.e (antenna , transmitter) by eqivalent sources

Both the machines are similar in capacity , by design and have same principle of operation .

If you were in a spaceship going at a speed of 9.8m/s^2, you would feel exactly same as if you were on the earth.

anything that can be done with hardware can also be done with software and anything done with software can also be done with hardware.

The non-compressibility of liquids, and the equivalence of p = F/A (pressure equals force divided by area) explain why and how hydraulics work.