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A metre stick is balanced on a knife edg...

A metre stick is balanced on a knife edge at its centre. When two coins, each of mass `5 g` are put one on of the other at the `12 cm` mark, the stick is found to balanced at `45 cm`. The mass of the metre stick is.

Text Solution

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Since the stick in in rotational equilibrium, the total torque of all the force about the resultant `R` is zero. Taking the turning effects about the point of action of the resultant `R` we have `10gxx33=mgxx5, m=66 g`
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