Oscillations

Question: A simple pendulum is set up in a trolley which moves to the right with an acceleration a on a horizontal plane. Then the thread of the pendulum in the mean position makes an angle $\theta $ with the vertical



1) ${{\tan }^{-1}}\frac{a}{g}$ in the forward direction
2) ${{\tan }^{-1}}\frac{a}{g}$ in the backward direction
3) ${{\tan }^{-1}}\frac{g}{a}$ in the backward direction
4) ${{\tan }^{-1}}\frac{g}{a}$ in the forward direction
Solution: Explanation: No Explanation
Simple Pendulum

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