Concept explainers
Would it be possible to balance sharp needle on its point.
Answer to Problem 5Q
Solution:
It is not possible to balance a needle on its point.
Explanation of Solution
To balance a needle on its point, one needs to bring into equilibrium of forces.
This involves both translational and
We cannot simultaneously ensure that the centre of mass of the needle is vertically above the point of contact, and also that their relative velocity is zero. This is because of the Heisenberg Uncertainty Principle.
If we ensure that the points are vertical, their relative velocity may not be zero and the centre of mass will move ahead, exerting a torque that brings the needle down. If we ensure zero relative velocity, then the points may not be vertical.
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Physics: Principles with Applications
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