Chapter 6: Problem 1
Make a reasonable estimate of the average amplitude and wiavelength of typical waves on the ocean and compute the power they carry. Express the result in horsepower per mile of wavefront.
Chapter 6: Problem 1
Make a reasonable estimate of the average amplitude and wiavelength of typical waves on the ocean and compute the power they carry. Express the result in horsepower per mile of wavefront.
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Get started for freeConstruct an alternative derivation of the equation of continuity based on Gauss' theorem $$ f \mathrm{~V} \cdot d \mathrm{~S}=\int \nabla \cdot \mathrm{V} d r $$ Hinf: Let \(\mathbf{V}=\rho \mathbf{v}\) and interpret what Gauss' theorem is telling us.
Make an w-k diagram for water waves when both surface tension and gravity are taken into account. Assume that the water is deep, so that tanhkh \(=1\). Discuss the phase and group velocity of the water waves on the basis of this diagram.
The fluid in the vicinity of an arbitrary point \(P\) is rotating with the angular velocity \(\omega\) with respect to an inertial frame. Take an origin for a position vector \(\mathbf{r}\) at \(P\) and show that the velocity \(\mathbf{u}\) with respect to \(P\) of fluid in the vicinity of \(P\), whose position vector is \(\mathbf{r}\), is given by \(\mathbf{u}=\omega \mathbf{X} \mathbf{r}\). If \(\mathbf{v}_{\boldsymbol{P}}\) is the velocity of transport of the point \(P\) (with respect to an incrtial frame), then the velocity of the fluid in the vicinity of \(P\) with respect to the inertial frame is \(\mathbf{v}=\mathbf{v}_{P}+\omega \times \mathbf{r} .\) Show that \(\omega=\frac{1}{2} \mathbf{v} \times \mathbf{v}\) by taking the curl of \(\mathbf{v}\).
A layer of oil of density \(P_{0}^{\prime}\) is superposed on water of density \(P\). Find the velocity of waves that can exist on their common boundary when the depth of each liquid considerably exceeds one wavelength. \(A_{n s w e r:} c^{2}=(g / \kappa)\left(\rho_{0}-\rho_{0}^{*}\right) /\left(\rho_{0}+\rho_{0}^{*}\right)\).
Show how to modify the theory of pure surface tension waves when the plane interface is between two liquids of densities \(\rho_{0}\) and \(\rho_{0}^{\prime}\) and, in particular, show that \(c=\left[r_{0} \times /\left(\rho_{0}+\rho_{0}^{\prime}\right)\right]^{1 / 2} .\)
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