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    Determining direction of wave propagation from the phase?

    Take r vector to be in the direction of k vector. Now, take kx-wt=A (some constant phase) and differentiate it with respect to t . you get dx/dt=w/k which is the velocity of the point whose A(phase) is constant, and hence velocity of wave . It is called phase velocity. Direction of the...
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    General Friction Info& Inclined Planes

    Frictional force depends upon contact between two materials. It arises due to electromagnetic interaction between the atoms of two materials. See [Broken] PS: there are plenty of graphic softwares for creating images like inclined planes. Try MS paint, adobe...
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    Why Legendre transform?

    It empowers you to work with intensive variable rather than extensive variable [Broken]