Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.40x106 N , one at an angle 16.0 ° west of north, and the other at an angle 16.0 ° east of north, as they pull the tanker a distance 0.830 km toward the north.

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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.