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A hemispherical tank of diameter 10m is filled by water issuing from a pipe of radius 20cm at 2m per second calculate correct to 3 significant figures the time in minute it takes to fill the tank
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(4/3 πr^3) ÷ (πr^2 h)/s = (4/3 π * 125) ÷ (π*0.20^2*2) = 1041.667 seconds
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