physics lab instructor is working on a new demonstration. She attaches two identical copper globes with mass  m = 0.190 g  to strings of length L as shown in the figure. There are two strings in the figure. The top of each string is connected to the ceiling, and both strings are connected at the same point. The bottom of each string is connected to a spherical mass labeled m. Both strings have length L and hang at an angle of θ to the vertical, with the two strings on opposite sides of the vertical. Both globes have the same charge of 6.40 nC, and are in static equilibrium when θ = 4.75°. What is L (in m)? Assume the strings are massless. Find mass   (b) What If? The charge on both globes is increased until each string makes an angle of θ = 9.50° with the vertical. If both globes have the same electric charge, what is the charge (in nC) on each globe in this case? Find nC

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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.