A sheet ABCD in the shape of a Rhombus has mass m and length of each side l as shown in figure. Then moment of inertia of the sheet about side AB is
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a
13ml2
b
14ml2
c
34ml2
d
16ml2
answer is B.
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Detailed Solution
M.I. of ABCD about AB=M.I. of the rectangle CDEF about EF + M.I. of the triangle ADE about AE - M.I. of triangle BCF about BF =M.I. of rectangle CDEF about EF DE=AD sin600=3 l2 ∴ I=13mDE2 = 13m3 l22=14ml2