A) \[\overrightarrow{r}.\overrightarrow{\tau }=0\]
B) \[\overrightarrow{F}.\overrightarrow{\tau }=0\]
C) \[\overrightarrow{r}.\overrightarrow{\tau }=0\]
D) \[\overrightarrow{F}.\overrightarrow{\tau }\ne 0\]
Correct Answer: A
Solution :
Let m is the mass per unit length then rate of mx mass per \[{{V}_{C}}={{V}_{A}}\ne {{V}_{B}}\] Rate of \[{{V}_{C}}={{V}_{B}}\ne {{V}_{A}}\]
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