A box is cubical with sides of proper lengths L1 = L2 = L3 = 2.5 m, as shown in the figure below, when viewed in its own rest frame. This block moves parallel to one of its edges with a speed of 0.82c past an observer.
(a) What shape does it appear to have to this observer?
sphericalrectangularpyramidalcubical
(b) What is the length of each side as measured by this observer? Assume that the side that the block is moving parallel to is L1.L1 = mL2 = mL3 = m.