A railway track is banked for a speed ' $v$ ' by elevating outer rail by a height ' $h$ ' above the inner…

A railway track is banked for a speed ' $v$ ' by elevating outer rail by a height ' $h$ ' above the inner rail. The distance between two rails is ' $\mathrm{d}$ ' then the radius of curvature of track is ( $\mathrm{g}=$ gravitational acceleration)
  1. $\frac{\mathrm{v}^2 \mathrm{~d}}{\text { gh }}$
  2. $\frac{2 \mathrm{v}^2}{\mathrm{gdh}}$
  3. $\frac{g d}{2 v^2 h}$
  4. $\frac{v^2}{2 g h d}$

Solution

From figure, $\begin{array}{ll} & \tan \theta=\frac{\mathrm{h}}{\mathrm{d}} \\ \therefore \quad & \frac{\mathrm{v}^2}{\mathrm{rg}}=\frac{\mathrm{h}}{\mathrm{d}} \quad \ldots .\left(\because \tan \theta=\frac{\mathrm{v}^2}{\mathrm{rg}}\right) \\ \therefore \quad & \mathrm{r}=\frac{\mathrm{v}^2 \mathrm{~d}}{\mathrm{gh}} \end{array}$

Asked in: MHT CET 2023 (12 May Shift 1)

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