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A reference frame is a particular coordinate system chosen to represent physical entities. The notion is most often used in special and general relativity to denote particular coordinates chosen on the spacetime manifold.

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I need help calculating moment/torque of an object [closed]

Heyo! I'll do my best to ask this question as clear as possible, but since English is not my mother tongue it might be hard :D I added the assignment above. S is the point of rotation and the arrows …
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