Wednesday, November 16, 2016

classical mechanics - What is really instantaneous?


How can a body travel at an instant and what does instantaneous speed tells us? What really is meant by speed of an object at an instant if an object does not travel at an instant? I would like a mathematical explanation.




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...