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27 April, 16:58

A spherical ball is immersed in water contained in a vertical cylinder. The rise in water level is measured in order to calculate the radius of the ball. Calculate the radius of the ball in the following cases:

(a) : cylinder of radius 10cm, water level rises 4cm.

(b) : cylinder of radius 100cm, water level rises 8cm

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  1. 27 April, 17:04
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    Immersed = > totally submerged

    a) Volume occupied by the ball, V = area of the base of the cylynder * water level rise

    V = π (r^2) (4cm) = π*100cm^2*4cm = 400 π cm^3

    Volume of a sphere = [4/3]π (r^3) = 400 π cm^3 = >

    r^3 = 300 cm^3 = > r = ∛ (300 cm^3) = 6.69 cm

    b) V = π (100cm) ^2 (8cm) = 80,000 π cm^3

    [4/3]πr^3 = 80,000π cm^3 = > r^3 = 60,000 cm^3 = > r = 39.15 cm
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