A) \[m=20\,kg\]
B) \[m=5\,kg\]
C) \[m=2\,kg\]
D) \[m=7\,kg\]
Correct Answer: A
Solution :
\[v=\sqrt{\frac{T}{\mu }}\] For equilibrium \[Mg=mg\sin 30=T\] Þ \[M=\frac{m}{2}\] Þ \[100=\sqrt{\frac{Mg}{9.8\times {{10}^{-3}}}}=\sqrt{\frac{M(9.8)}{9.8\times {{10}^{-3}}}}\] Þ \[100=\sqrt{M(1000)}\] Þ \[M=10kg\] and \[m=20kg\]You need to login to perform this action.
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