The spool has a mass, m, and a radius of gyration, kG. The inextensible cord is attached to the wall at A. The cord is wound around the radius R, and the out radius 2R. The coefficient of friction between the ground and the spool is mu.  Given the quantites given, m, kG, R, and mu, write the solution in terms of the given quatities. Find the critical force (force required to cause motion) Fcrit. The force is applied at point B. See attached drawing. Let the force be 2Fcrit. What is the linear acceleration of the center of mass? If the force is 2Fcrit, what is the tension in the cord AC?

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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.