question_answer

Two bodies of masses 0.03 kg, and 0.04 kg, are tied to the ends of a massless string. This string passes over the frictionless pulley. The tension in the string is

A)  0.336 N  

B)  0.294 N

C)  683N

D)  0.392 N

Correct Answer: A

Solution :

 Referring figure,             \[0.04g-T=0.04a\]                       ? (i) and       \[T-0.03g=0.03a\]                       ? (ii) \[\therefore \]      \[0.04g-(0.03a+0.03g)=0.04a\] \[\Rightarrow \]   \[a=1.4\] \[\therefore \]      \[T=0.03\times 1.4+0.03\times 9.8\]             \[=\mathbf{0}\mathbf{.336}\,\,\mathbf{N}\]