question_answer

A straight rod AB of length 1ft balances about a point 5 inches from A when masses of 9 lbs and 6 lbs are suspended from A and B respectively. It balances about a point 3- inches from B when the mass of 6 lbs is replaced by one of 23 lbs. The distance of C.G. of the rod from the end B is

A)  \[3\,\,\frac{1}{2}inches\]                       

B)  \[5\,\,\frac{1}{2}inches\]

C)  \[2\,\,\frac{1}{2}inches\]                       

D)  \[7\,\,\frac{1}{2}inches\]

E)  None of these