physics problems are fun...
The people that write these books have quite the sense of humor...i found this problem in chapter 37 of my new $160 physics book:
Standing beside railroad tracks, we are suddenly startled by a relativistic boxcar traveling past us. Inside, a well-equipped hobo fires a laser pulse from the front of the boxcar to its rear. (a) is our measurement of the speed of the pulse greater than, less than, or the same as that measured by the well-equipped hobo? (b) Is his measurement of the flight time of the pulse a proper time? (c) Are his measurement and our measurement of the flight time related?
Standing beside railroad tracks, we are suddenly startled by a relativistic boxcar traveling past us. Inside, a well-equipped hobo fires a laser pulse from the front of the boxcar to its rear. (a) is our measurement of the speed of the pulse greater than, less than, or the same as that measured by the well-equipped hobo? (b) Is his measurement of the flight time of the pulse a proper time? (c) Are his measurement and our measurement of the flight time related?