# Who stays on earth while the other one travels to

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who stays on Earth while the other one travels to space. After what seems like a short trip for the twin that traveled to space, the twin returns to her twin sister has aged. According to relativity and time dilation, time runs more slowly on the twin that is on the space ship than it does for the twin on Earth. Special relativity says that physics is the same in reference frames that move at a uniform velocity relative to one another. However, this isn’t a true paradox because the inertial frames of reference changed for the twin that traveled to space.
Lab Problem 1. A particle has a rest mass of 6.64E-27 kg and moves at a speed that is 92% the speed of light. Show all work for the following problems: a. What is the rest energy of the particle? 2 J
b. What is the total energy (kinetic plus rest energy) of the particle? J) J
c. What is the kinetic energy of the particle? J