NEET-XI-Physics
exam-2 year:2016
- #120Two rotating bodies A and B of masses m and 2m
with moments of inertia ``I_A`` and ``I_B`` (``I_B`` > ``I_A``) have equal
kinetic energy of rotation. If ``L_A`` and ``L_B`` be their
angular momenta respectively, then :-
(1) ``L_B``> ``L_A``
(2) ``L_A`` > ``L_B``
(3) ``L_A`` = ``L_B``/2
(4) ``L_A`` = 2``L_B``digAnsr: 1Ans : (1)
Sol. KA = KB &implies;
2 2
A B
A B
L L
2I 2I
=
As IB > IA So,ï€
2 2
A BL L &implies;ï€ LA < LB