You are an observer in a 100-m long spacecraft traveling from the earth to the moon at 0.8c. (a) What is the proper length of the spacecraft? (b) For a proper time interval of 1 sec., the relativistic time interval for the spacecraft measured from the earth reference frame would be: (c) Time dilation does not apply to all time-dependent physical and biological processes. T/F? (d) What is the relativistic length, DL measured from the reference frame of earth? (e) An APOLLO crew left a flat mirror reflector on the surface of the moon. If the average surface-to-surface distance from the earth to the moon is 3.83 x 108 m, then how long does it take moonlight to reach earth?

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.