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    Differences between delta W or dW

    Why in some sites, the work appears like \ \ \delta W instead of dW ? Whats the differences between \ \delta W and dW? thanks
  2. D

    Fluid Mechanics question,velocity potential

    I am new in this place, am studying civil engineering in Spain,Madrid, and is something I do not understand in a theoretical exposition of the velocity/force potential. They suppose that the external force that it acts in each point of the fluid and the speed, derive from scalar , so they...
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