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17 November, 20:03

Given a sphere of diameter, d. What is the percentage increase in its volume when surface area increases by 21%?

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  1. 17 November, 22:25
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    S1 = Pi * D1^2

    solve for D1

    D1 = sqrt (S1 / pi) S2 = Pi * D2^2

    S2 = 1.21*S1

    S2 = 1.21 * Pi * D1^2

    1.21 * Pi * D1^2=

    Pi * D2^2

    D2 D2 = sqrt (1.21 * D1^2)

    Now V2 = pi/6 * D2^3. V2

    = pi/6 (sqrt (1.21*D1^2)) ^3 V2

    = pi/6 * (1.21 * D1^2) ^ (3/2) V2

    = pi/6 * 1.21^ (3/2) * D1 ^3 = (pi/6 * D1^3) * 1.21^3/2 = V1 * 1.21 ^ (3/2)

    =43% approximately
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