A cylindrical block of wood (density = 650 kg m–3), of base area 30cm2 and height 54 cm, floats in a liquid of density 900 kg m–3. The block is depressed slightly and then released. The time ** of the resulting oscillations of the block would be equal to that of a simple pendulum of length (nearly) :
(1) 52 cm
(2) 65 cm
(3) 39 cm
(4) 26 cm
