The plug for the drain of a water tower is located 3.0 m below the surface. The plug is circular and has a diameter of 5.0 cm. If the density of water is 1000 kg/m3 , how much force is required to remove the plug (you may ignore the weight of the plug itself)
A= pi * r ^2
The Attempt at a Solution
A = pi * r^2 = pi * (0.025)^2 =1.96 * 10 ^-3 m^2
F= pGH * A
= (1000 kg/m3) (9.8) (3.0 m) * 1.96 * 10 ^-3 m^2
= 57.624 N
is this correct? there is no pressure from the atmosphere right?