A concrete sphere of radius R has a cavity of radius r which s packed with sawdust. The specific gravities of concrete and sawdust are respectively 2.4 and 0.3 for this sphere to float with its entire volume submerged under water. Ratio of mass of concrete to mass of sawdust will be
Text Solution
Verified by ExpertsThe correct answer is:
B
Let specific gravities of concrete and saw dust are 
and
respectively. According to principle of floatation weight
of whole sphere = upthrust on the sphere
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
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