Recent content by bojo

so A^2 -3A = 2I factors to A(A-3)=2I and using property det(AB)=det(A)det(B) det(A)det(A-3)=det(2I) so det(A)=det(2I)/det(A-3)

Homework Statement Let A be a 3 x 3 matrix satisfying the equation A^{2}-3A-2I=0 where I is the 3x3 identity matrix. Find det(A) given the det(A-3)=2 The Attempt at a Solution Well can't find anything like this in my textbook, notes or google. I imagine its a pretty simple matrix...

AH! this is where I've been going wrong. Stupidly I've been just using the north component of the spaceship's velocity - makes no sense to do that now you've pointed it out. Thanks very much!

i understand the need to have the parallel spatial axes but i don't quite understand how to figure out the coordinates? is the equation i stated the correct one to use in this example?

Homework Statement Observer O sees a fire-engine leave its station 6363 m due north from Cape Canaveral, where the super-shuttle Lorentz had been launched 10^-5 s earlier. A space-cruiser flying north-east sees these two events also 10^-5 s apart, but with the shuttle launch occurring after...