In Fig. 2, a thin uniform rod (mass ??3.0? kg , length ??4.0 m )
rotates freely about a horizontal axis A? that is perpendicular to the
rod and passes through a point at distance ? ?d=1.0 ?? m from the
end of the rod. The kinetic energy of the rod as it passes through the
vertical position is ??20 J. (a) What is the rotational inertia of the rod
about axis ?A ? (b) What is the (linear) speed of the end ? Bof the rod
as the rod passes through the vertical position? (c) At what angle ?
will the rod momentarily stop in its upward swing?