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If a person A is stationary, let's say, with respect to a universal inertial frame, and another person B starts to move near light speed with respect to the same frame. When both encounter each other …

Isn't this diagram wrong? I mean, following the reasoning, you can draw a straight line inside the cone in such way that the inclination is greater than the bisector line. Tracing a vertical line ove …

I am not sure if i got the question Say two humans, a proper distance $L$, shot each other. The time it takes to the particles hit themselves is given by $$v_1 t = L - v_2 t \Rightarrow t = \frac{L}{v …

I am having some problems involving the force that a source moving with speed $v$ along the $x$-axis would exert on a test charge at the $x$-axis. Moving to the frame of the source charge, we got that …

A and B both start at the origin and simultaneously head off in opposite directions at speed $3c/5$ with respect to the ground. A moves to the right, and B moves to the left. Consider a mark on the g …

A spaceship departs from the origin of the LCF Σ and moves along the $x$-axis with constant proper acceleration $a = 10 m/s^2$ until it attains the speed $v = 0.5 c$. Calculate the time the spaceship …

Ok, some corrections right? The light never gain or lose velocity, its speed is always $c$ (in vacuum, anyway...). So you are asking how can it travel in a diagonal, if it is a wave, right? I could as …

Now, the Lagrangian is $$L = -m \sqrt{-n_{ab} \frac{d\xi^{a}}{d\lambda} \frac{d\xi^{b}}{d \lambda}}.$$ In the notes i am reading, it was said that the momentum $$p_{a} = \frac{\partial L}{\partial (\f …