Perhaps an engineer could state how much energy is contained in a Trent turbine wheel at take off power, and better still offer a comparison to something more easily understood.
I take it that the specific impulse would be measured in some reasonable unit like Newton metres, or foot pounds?
Or maybe, it's more like a KE thing?
Or is it a Joules thing? It's been a while since last I was in Mr Stirlings physics class.