| 11. | After averaging, the continuity and momentum equations become
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| 12. | A general momentum equation is obtained when the conservation relation is applied to momentum.
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| 13. | From there the momentum equation, and the conjugate depths equation can be derived.
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| 14. | For both momentum equations, the time derivative becomes
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| 15. | Then the angular equation in the momentum equations and the continuity equation are identically satisfied.
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| 16. | Now the Mach number can be derived directly from the dimensionless form of the momentum equation.
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| 17. | The third momentum equation reduces to:
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| 18. | For constant density, the momentum equation ( divided by the density \ rho ) is:
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| 19. | On the contrary, it is always greater than for a tachyon whose energy-momentum equation is
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| 20. | By contrast, the hypothetical exotic matter has a negative mass and the energy-momentum equation is
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