The spacetime of Special Relativity is Minkowski's "Block Universe" where time is treated as a dimension. Does General Relativity allow for an arrow of time or "flow" of time? If yes, can this be considered the cosmological arrow of time in the expanding universe, since the Friedmann equations ar...

Can we change the volume of a wire by applying force on it in order to stretch it, if yes is there any way to calculate it ??