When a 2.75 kg fan, having blades 18.5 cm long is turned off, its angular speed decreases uniformly from 10.0 rad/s to 6.30 rad/s in 5.00 s. (a) What is the magnitude of the angular acceleration of the fan? (b) What is the speed of tip of the fan blades at the time the fan is turned off? (c) How many revolutions does the fan undergo while it is slowing down, during the 5.00 s?

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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.