A 3.0-kg box is held at rest against a vertical wall by a pushing force from my hand. Use g = 10 m/s2. Match the anwers with questions. 120 N 3 kg A What is the magnitude and direction of the weight force on the box from the earth? + What is the magnitude and direction of the pushing force on the box from the hand? What is the magnitude and direction of the normal force on the box from the wall? + What is the magnitude and direction of the friction force on the box from the wall?

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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.