A uniform cylinder of length L and mass M having
cross-sectional area A is suspended, with its length vertical,
from a fixed point by a massless spring, such that it is
half-submerged in a liquid of density p at equilibrium position.
When the cylinder is given a small downward push and
released it starts oscillating vertically with a small amplitude. If
the force constant of the spring is k, the frequency of oscillation
of the cylinder is