$A$ lift is tied with thick iron ropes having mass $M$. The maximum acceleration of the lift is $a \ m/s^2$ and the maximum safe stress is $S \ N/m^2$. The minimum diameter of the rope is
- A$[\frac{6 M(g+a)}{\pi S}]^{\frac{1}{2}}$
- B$[\frac{4 M(g+a)}{\pi S}]^{\frac{1}{2}}$
- C$[\frac{M(g+a)}{\pi S}]^{\frac{1}{2}}$
- D$[\frac{M(g-a)}{\pi S}]^{\frac{1}{2}}$
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View SolutionTwo identical blocks each of mass $M$ are attached to the ends of a massless inextensible string which passes over a pulley with a fixed axis as shown below. $A$ small mass $m$ is now placed on block $B$ (the right block). The acceleration with which the two blocks move together is ($g =$ gravitational acceleration).
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