A uniform disc of radius 8cm lies in the x-y plane, with its centre at origin. Its moment of inertia about z-axis is equal to its moment of inertia about the line 4y=3x+c. Where c is constant. Find the value of c(tan37o=0.75)
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a
±25 cm
b
±10 cm
c
± 20 cm
d
±8 cm
answer is C.
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Detailed Solution
IZ=MR22 The line, 4y=3x+C or y=34x+C4 m=tanθ=34; OB=C4, θ=370 In ΔOAB, OA=OBcos370=(C4)(45)=C5I1=IZ=IO+M(c5)2 [∵ Parallel axes theorem]MR22=MR24+M(c5)2⇒MR24=M(c5)2⇒C5=±R2⇒C=±5R2
A uniform disc of radius 8cm lies in the x-y plane, with its centre at origin. Its moment of inertia about z-axis is equal to its moment of inertia about the line 4y=3x+c. Where c is constant. Find the value of c(tan37o=0.75)