JEE Main Physics question
A stone of mass kg tied to a light inextensible string of length m is whirled in a circular path of radius in a vertical plane. If the ratio of the maximum tension to the minimum tension in the string is , and m/sec², the speed of the stone at the highest point of the circle is [CBSE PMT 1990]
Answer: (D)
Solution
always (standard result for vertical circular motion). With : $=6mg⇒
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