a 65kg person stands on earths surface (assume distance is to the equator.) Earths mass is 5.97 x 10^24 kg and earths equatorial radius is 6.38 x 10^6 m. 1) Calculate the acceleration of the person due to Earths field. 2) Calcuate the acceleration of the earth due to the person.

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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.