A bus is moving with a constant acceleration \( a=3 g / 4 \) towards right. In the bus, a ball i....

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A bus is moving with a constant acceleration \( a=3 g / 4 \) towards right. In the bus, a ball is tied with a rope of length
\( \mathrm{P} \)
\( \ell \) and is rotated in vertical circle as shown.

At what value of angle \( \theta \), tension in the rope will be minimum
(1) \( \theta=37^{\circ} \)
(2) \( \theta=53^{\circ} \)
(3) \( \theta=30^{\circ} \)
(4) \( \theta=90^{\circ} \)


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