| 41. | Note : Here, speed means the time derivative of a displacement, not the speed of sound.
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| 42. | A common occurrence in physics is the time derivative of a vector, such as velocity or displacement.
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| 43. | The overdot on the " m " is Newton's notation for a time derivative.
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| 44. | :Ehrenfest's theorem gives you the time derivatives of the average of the position and momentum.
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| 45. | :For the first question : Newton's laws have no time derivatives higher than order 2.
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| 46. | The time derivative of the changing momentum of the object is what we label as " gravitational force ".
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| 47. | Time derivatives are denoted by dots, and are evaluated according to Hamilton's equations for the system.
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| 48. | The time ordering is taken before the time derivatives inside the, " i " } }.
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| 49. | For high stress states / short time periods, the time derivative components of the stress strain relationship dominate.
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| 50. | These induced currents are proportional to the time derivative of the magnetic field, leading it by 90 degrees.
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