, A uniform rod of mass m and length / is held inclined at an angle of 600 with the vertical. What will-be potential energy of the rod in this position ?
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a
m g I
b
m g I/2
c
m g I/3
d
m g I /4
answer is D.
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Detailed Solution
See fig. (12). Let the center of gravity of the rod be at aheight ft. From figure,h=OCsin30∘=(l/2)sin30∘=l/4 P.E. =mgh=mgl/4