Recent content by rahulk

  1. R

    Undergrad 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...
  2. R

    High School 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 http://www.actionurl.com/ia9fh PS: there are plenty of graphic softwares for creating images like inclined planes. Try MS paint, adobe photoshop etc.
  3. R

    Graduate Why use a Legendre transform instead of a simple change of variable?

    It empowers you to work with intensive variable rather than extensive variable http://www.actionurl.com/b1oc6