A cylindrical plastic bottle of negligible mass is filled with 310 ml of water and left floating in a pond with still water. If pressed downward slightly and released, it starts performing simple harmonic motion at angular frequency ω. If the radius of the bottle is 2.5 cm then ω is close to : (density of water = 103 kg/m3)
(1) 7.85 rad *–1
(2) 5.00 rad *–1
(3) 3.75 rad *–1
(4) 2.50 rad *–1
