question_answer

A block of mass \[{{m}_{1}}\]is suspended from the ceiling of a room through a rope of mass\[{{m}_{2}}.\] The ceiling pulls the chain by a force

A) \[{{m}_{1}}g\]                                  

B) \[({{m}_{1}}+{{m}_{2}})g\]         

C)      \[\frac{({{m}_{1}}{{m}_{2}})g}{2}\]         

D)      \[{{m}_{2}}g\]

Correct Answer: B

Solution :

Let the sought force be F. For the equilibrium of the entire system \[F={{m}_{1}}g+{{m}_{2}}g=({{m}_{1}}+{{m}_{2}})g\] Hence, the correction option is (b).