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QJEEM20Ph288b: JEE Main 2020 Physics - Class 11 JEEM20Ph288b Solution: A hollow spherical shell at outer radius R floats just…

A hollow spherical shell at outer radius R floats just submerged under the water surface. The inner radius of the shell is r. If the specific gravity of the shell material is 278 w.r.t water, the value of r is :

Multiple Choice Options

  • A 23R
  • B 49R
  • C 13R
  • D 89R

Step-by-Step Verified Solution

JEE Main 2020 (Online) 5th September Morning Slot Physics - Properties of Matter Question 187 English Explanation
43π(R3−r3)pmg=43πR3pwg

1−(rR)3=827

⇒rR=(1927)1/3=191/33

=0.88≃89

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