@BB84
@mander.xyzWhile it is true that space time dilation can cause red/blueshift, that is a distinct from the doppler effect which is the primary effect here.
(dilation plays only a small role: without time dilation our answer going from 700nm to 350nm would be 0.5c instead of the 0.6c calculated below)
One ton of TNT is 1E9 calories which is 4 gigajoules. So 0.2 petajoules should be only 50 kilotons of TNT?
Kinetic energy or total energy? Assuming the rose weight 10 grams I get that 1.12PJ total energy, but only 0.23PJ is kinetic.
As always, relevant Wikipedia links:
https://en.m.wikipedia.org/wiki/Al-Khwarizmi https://en.m.wikipedia.org/wiki/Donald_Knuth https://en.m.wikipedia.org/wiki/Algorithm