Answer: 1.03 × 10⁵ N
Explanation:
Force of gravity due to liquid column in a tank is given by the product of pressure due to the liquid column and area on which this pressure is acting.
Force, F = P × A
Pressure, P = ρ g h
where, ρ is the density of the liquid
g is the acceleration due to gravity
h is the height of the liquid column
It is given that, h = 7 m
Area, A = 1.5 m²
g = 9.81 m/s²
density of water, ρ = 1000 kg/m³
⇒ F = ρ g h × A = 1000 kg/m³ × 9.81 m/s² × 7 m × 1.5 m² = 103005 N
Hence, force of gravity acting on the column of water is 1.03 × 10⁵ N