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JEE Mains · Physics · STD 11 - 9.1 fluid mechanics

\(R\) ત્રિજ્યા ધરાવતા ઘન ગોળાની દળ ઘનતા \(\rho(\mathrm{r})=\rho_{0}\left(1-\frac{\mathrm{r}^{2}}{\mathrm{R}^{2}}\right),  0<\mathrm{r} \leq \mathrm{R}\) મુજબ આપવામાં આવે છે. ઓછામાં ઓછી કેટલી ઘનતા ધરાવતા પ્રવાહીમાં ગોળો તરશે?

  1. A \(\frac{\rho_{0}}{5}\)
  2. B \(\frac{\rho_{0}}{3}\)
  3. C \(\frac{2\rho_{0}}{3}\)
  4. D \(\frac{2\rho_{0}}{5}\)
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Answer & Solution

Correct Answer

(D) \(\frac{2\rho_{0}}{5}\)

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Detailed explanation

In case of minimum density of liqued, sphere will be floating while completely submerged So \(\mathrm{mg}=\mathrm{B}\) \(\mathrm{m}=\int_{0}^{\mathrm{R}} \rho\left(4 \pi \mathrm{r}^{2} \mathrm{dr}\right)=\mathrm{B}\)…
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