rotational mech

Are the answers these ?

1>a
2>a
3-- cannot be seen

here is my process

for the first one

JR=Iw

but w=2Ï€

R=5/2cm=5/2(10^-2)m

J=1*sinθ=4/5

replacing the valkues we get the answer

for the second one just complete the prism by turning it into a cuboid

thus now the prism consists of a cuboid and a nagetive mass M

thus

M(3²)/12+M(4²)/12-I=I

we know the valueof I

thus we get the value of M

:)

the main point was to find moi.. :)

[9] maybe he thot it was too mundane to mention

one small thing abhishek......can you help me here

http://targetiit.com/iit_jee_forum/posts/full_test_3_d_3220.html

i know it is some small or silly mistake that i have done

rohan,one doubt,can u explain this
"M(3²)/12+M(4²)/12-I=I"