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

A metre stick is balanced on a knife edge at its centre when two coins

1.	A metre stick is balanced on a knife edge at its centre when two coins, each of mass 5g are put one on top of the other at the 12 cm mark. The stick is found to be balaced at 45 cm. What is the mass of the metre stick ?
Answer» Solution :SINCE stick is in rotational EQUILIBRIUM, the total torque of all the forces about the resultant .R. is zero. TAKING the turning effects about the point of ACTION of the resultant .R. we have `10gxx33=mgxx5` on solving m=66 G