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NEET 2015 (AIPMT) · Circular Motion (Related PYQs)

Circular Motion (Related PYQs) question from NEET 2015 (AIPMT)

Q7NEET 2015 · AIPMTEasy

Circular Motion (Related PYQs)

Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius r2\frac{r}{2} and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they exprience same centripetal forces. The value of n is

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Answer: (c)

  1. Equal centripetal forces: mv12r=2m v22r/2\frac{m v_1^2}{r} = \frac{2m\,v_2^2}{r/2}
  2. v12=4v22⇒v1=2v2v_1^2 = 4v_2^2 \Rightarrow v_1 = 2v_2
  3. So n=2n = 2, the answer is (c).
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