A) \[2A\,\,\cos \,5\pi (x-400t)\]
B) \[A\,\,sin\,5\pi (x-400t)\]
C) \[A\,\,\cos \,5\pi (x-400t)\]
D) \[12.25V\]
Correct Answer: C
Solution :
(c.)To prevent slipping \[T=2{{T}_{0}}+\eta {{V}^{2}}\] The body will topple about point O, if \[\eta \] Here, \[h=2a\,\cos {{30}^{o}}=a\sqrt{3}\] \[\Rightarrow \] \[\mu \,\,mg\,\,\,\,a\sqrt{3}\ge mg\frac{a}{2}\]\[\Rightarrow \] \[\mu \ge 0.21\]
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