Relativity slides

In S frame, the cube has all sides with length of $a$ and volume $a^3$. Align one of the side with the x dimension, in which the S' frame is moving too. hen measured from a moving frame S', the length of the side of the cube aligned with the x  will be measured shorter (length contraction). The other two sides perpendicular to the direction of motion will not be affected. Calculate the $\gamma$ with 0.8c and find the measured length $l=\frac{a}{\gamma}$. The measured volume should be $V=la^2$.