A) 1.5 m
B) 2.0 m
C) 2.5 m
D) 3.0 m
Correct Answer: A
Solution :
Key Idea: Position of centre of gravity of a continuous body is given by \[{{r}_{CG}}=\frac{\int{rdm}}{M}.\] A rod lying along any of coordinate axes serves for us as continuous body. Suppose a rod of mass M and length L is lying along die x-axis with its one end at x = 0 and the other at x = L. Mass per unit length of the rod \[=\frac{M}{L}\] Hence, the mass of the element PQ of length dx \[=\frac{M}{L}\,dx\]You need to login to perform this action.
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