A person with mass 74 kg sits on a 2680 N-barber's chair. The output plunger of a hydraulic system begins to lift the chair when the barber's foot applies a force F to the input piston. If the ratio of the radius of the plunger to the radius of the piston 26.4, what is the applied force F?

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Q: 3,1,2

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A:

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.