Mild-mannered Clark Kent pushes a box with a force F = 735 at an angle of 21° below the horizontal. Find the Normal Force, the Friction Force, the Net Force in the X Direction and the acceleration in the X direction. The mass of the crate is m = 77 kg and the coefficient of kinetic friction between the crate and the floor is 0.21. Normal Force: Friction Force: N Fnetx: N Acceleration: m/s/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.