For a concrete sphere of radius R having a cavity of radius r packed with sawdust, to float with its entire volume submerged under water what will be the ratio of mass of concrete to mass of sawdust? Given the specific gravities of concrete and sawdust are respectively 2.4 and 0.3.
Text Solution
Verified by ExpertsThe correct answer is:
B
Let specific gravities of concrete and sawdust are 
and 
respectively.
According to principle of floatation, weight of whole sphere = up thrust on the sphere
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