Marbles of diameter 1.4 cm are dropped into beaker containing some water and are fully submerged. The diameter of beaker is 7 cm. Find how many marbles have been dropped in if the water rises by 5.6 cm
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Volume of water that rises in putting marbles in the beaker.
= π(7/2)2 × (5.6) cu cm.
Volume of one marble = 4/3π(0.7)3 cu cm.
∴ Number of marbles = π(7/2)2 × 5.6/4/3π(0.7)3 = 150
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