College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 18

A box is cubical with sides of proper lengths L 1 = L 2 = L 3 , as shown in Figure P26.12, when viewed in its own rest frame. If this block moves parallel to one of its edges with a speed of 0.80 c past an observer, (a) what shape does it appear to have to this observer (b) What is the length of each side as measured by the observer