The Student Room Group

Reynolds Transport Theorem

Hi,
I have a question about using Reynolds Transport Theorem as a conservation of momentum. In the case of control volume with constant velocity and not deformable one we should use all velocities relative to the control volume! I don't understand why should we use relative velocity in volume integral term?! I know that we should velocity relative to a inertial coordinate system! but both control volume and the ground could be inertial coordinate! could anyone help me with this please? :smile:

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