Q6 of 75 Page 236

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

Inner radius (r1) = 1 m

External radius (r2) = (1 + 0.1) cm


= 1.01 cm


Volume = external volume – inner volume


= πr23 - πr13


= π (r23 – r13)


= * * [(1.01)3 – (1)3]


= * 0.030301


= 0.06348 m3 (Approx)


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