College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 40

An observer moving at a speed of 0.995 c relative to a rod (Fig. P26.49) measures its length to be 2.00 m and sees its length to be oriented at 30.0° with respect to its direction of motion. (a) What is the proper length of the rod (b) What is the orientation angle in a reference frame moving with the rod