A thin uniform heavy rod of length l hangs from a horizontal axis passing through one end. The in...

A thin uniform heavy rod of length l hangs from a horizontal axis passing through one end. The initial angular velocity ω that must be imparted to it to rotate it through 90^∘ is :
Figure 5.113
(A) √(g 1 l)
(B) √(3 g / l)
(C) √(2 g / l)
(D) √(6 g / l)

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