A uniform rod of length l λ hangs vertically from a hinge passing through one end. The initial angular velocity ω ω that must be imparted to the rod so as to rotate it through 90 ° ° is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Initial K.E. of rotation = 
Finally, the total energy is P.E. = Mg 
where 
is the height through which c.m. of the rod is raised.
⇒ ⇒ 
⇒ ⇒ ω ω = 
is the correct
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