In a certain library the first shelf is 13.0 cm off the ground, and the remaining four shelves are each spaced 37.0 cm above the previous one. Part A If the average book has a mass of 1.70 kg with a height of 20.0 cm , and an average shelf holds 21 books (standing vertically), how much work is required to fill all the shelves, assuming the books are all laying flat on the floor to start? Express your answer to three significant figures and include the appropriate units. HA ? W = Value Units

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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.