Question

A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.

`["Assume "pi=22/7]`

 

Answer 1

Inner radius (r₁) of hemispherical tank = 1 m

Thickness of hemispherical tank = 1 cm = 0.01 m

Outer radius (r₂) of hemispherical tank = (1 + 0.01) m = 1.01 m

The volume of iron used to make such a tank = `2/3pi (r_2^3-r_1^3)`

= `[2/3xx22/7xx{(1.01)^3-(1)^3}]m^3`

= `[44/21xx(1.030301-1)]m^3`

= 0.06348 m³ (approximately)