Hello everyone! I've come across a problem that has quite tackled my mind and I was hoping someone could help me with it. I apologize in advance if the wording of the problem isn't completely comprehensible (I'm translating it word by word). So the problem is the following: Spaceship B moving relative to spaceship A by velocity v=0.6c ((x^^-y^^)/sqrt(2)) [the ^^ indicates "hat"]. Triangle ABC is a right triangle in spaceship A's system. What is the angle α(alpha) as it is measured by an observer in spaceship B? View attachment 6892 Thank you!
