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Homeroom
Homeroom

... Ama starts sliding with a velocity of 1 m/s. After 3s, her velocity is 7 m/s. What is Ama’s acceleration? What do you know? Initial velocity=1m/s, final velocity=7m/s, time=3s Write the formula: a= v(final)-(V)initial ...
LECTURE 1: Email:  “He who
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CHAPTER 2: Special Theory of Relativity
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slides - UMD Physics

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Clocks/meter sticks - University of Colorado Boulder
Clocks/meter sticks - University of Colorado Boulder

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Twin paradox

In physics, the twin paradox is a thought experiment in special relativity involving identical twins, one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more. This result appears puzzling because each twin sees the other twin as moving, and so, according to an incorrect naive application of time dilation and the principle of relativity, each should paradoxically find the other to have aged more slowly. However, this scenario can be resolved within the standard framework of special relativity: the travelling twin's trajectory involves two different inertial frames, one for the outbound journey and one for the inbound journey, and so there is no symmetry between the spacetime paths of the two twins. Therefore, the twin paradox is not a paradox in the sense of a logical contradiction.Starting with Paul Langevin in 1911, there have been various explanations of this paradox. These explanations ""can be grouped into those that focus on the effect of different standards of simultaneity in different frames, and those that designate the acceleration [experienced by the travelling twin] as the main reason..."". Max von Laue argued in 1913 that since the traveling twin must be in two separate inertial frames, one on the way out and another on the way back, this frame switch is the reason for the aging difference, not the acceleration per se. Explanations put forth by Albert Einstein and Max Born invoked gravitational time dilation to explain the aging as a direct effect of acceleration.The twin paradox has been verified experimentally by precise measurements of atomic clocks flown in aircraft and satellites. For example, gravitational time dilation and special relativity together have been used to explain the Hafele–Keating experiment. It was also confirmed in particle accelerators by measuring time dilation of circulating particle beams.
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