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Question: Answered & Verified by Expert
A person with his hand in his pocket is skating on ice at the rate of $10 \mathrm{~m} / \mathrm{s}$ and describes a circle of radius $50 \mathrm{~m}$. What is his inclination to vertical:

$\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{sec}^{2}\right)$
PhysicsLaws of MotionBITSATBITSAT 2014
Options:
  • A $\tan ^{-1}(1 / 2)$
  • B $\tan ^{-1}(1 / 5)$
  • C $\tan ^{-1}(3 / 5)$
  • D $\tan ^{-1}(1 / 10)$
Solution:
1002 Upvotes Verified Answer
The correct answer is: $\tan ^{-1}(1 / 5)$
Since surface (ice) is frictionless, so the centripetal force required for skating will be provided by inclination of boy with the vertical and that angle is given as $\tan \theta=\frac{\mathrm{v}^{2}}{\mathrm{rg}}$ where $\mathrm{v}$ is speed of skating $\&$

i is radius of circle in which he moves.

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