Using the debye approximation in 2d, show that the low temperature specific heat of a 2d solid has the functional form cv=k*t^n find the value of n, and an expression for k in terms of a definite integral. state your assumptions.

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.