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Help me, please. Anyone would do.

Help me, please.
Anyone would do.

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Grade:12

1 Answers

Mallikarjun Maram
50 Points
9 years ago

This question belongs to Mechanics thread.  It is answered there.  However, I have reproduced the same below:

We can use law of conservation of angular momentum and law of conservation of mechanical energy to solve this problem.

Initial angular momentum Li = mvb

Final angular momentum Lf = mVR (assuming that the mass m will just graze the surface of earth, as per requirement of the problem statement).

Initial Potential Energy Ui = 0

Final Potential Energy

Initial Kinetic Energy

Final Kinetic Energy

Substituting the values in and solving for b,

we get

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