Two rotating bodies, A and B of masses, m and 2 m with moments of inertia. I A and I B I B > I A have…

Two rotating bodies,  A and B of masses,  m and 2m with moments of inertia. IA and IB IB>IA have equal kinetic energy of rotation. If, LA and LB be their angular momenta, respectively, then,
  1. LA=LB2
  2. LA=2LB
  3. LB>LA
  4. LA>LB

Solution

E=L22I.

⇒EA=EB

⇒LA22IA=LB22IB.

IB>IA⇒LB>LA.

Asked in: NEET 2016 (Phase 2)

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