A bucket containing water is revolved in a vertical circle of radius ' $\mathrm{r}^{\prime}$. To prevent the…

A bucket containing water is revolved in a vertical circle of radius ' $\mathrm{r}^{\prime}$. To prevent the water from falling down, the minimum frequency of revolution required is $[\mathrm{g}=$ acceleration due to gravity $]$
  1. $\frac{1}{2 \pi} \sqrt{\frac{\mathrm{g}}{\mathrm{r}}}$
  2. $2 \pi \sqrt{\frac{\mathrm{g}}{\mathrm{r}}}$
  3. $\frac{2 \pi g}{r}$
  4. $\frac{1}{2 \pi} \sqrt{\frac{r}{g}}$

Solution

For minimum velocity at the highest point we should have $\mathrm{mr} \omega^{2}=\mathrm{mg}$ $\therefore \omega^{2}=\frac{g}{r} \quad$ or $\omega=\sqrt{\frac{g}{r}}$ $\begin{aligned} 2 \pi f &=\sqrt{\frac{g}{r}} \\ f &=\frac{1}{2 \pi} \sqrt{\frac{g}{r}} \end{aligned}$

Asked in: MHT CET 2020 (13 Oct Shift 2)

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