Two rigid bodies A and B rotate with rotational kinetic energies E_A and E_B respectively. The moments of inertia of A and B about the axis of rotation are I_A and I_B respectively. If I_A=(I_B)/(4) and E_A=100=E_B, the

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Correct answer: C. 5

From, the formula, rotational KE E_ rotational =(1)/(2) l ω^2=(L^2)/(2 )( L= ω) Therefore, L^2=2 E l Hence L_A^2=2 E_A I_A (i) and L_B^2=2 E_B I_B (ii) From Eq. (i) and (ii) aligned & (L_A)/(L_B)= (2 E_A I_B)/(2 E_B I_A) = (100)/(4) =5 & ( (E_B)/(E_A)=100 and (I_A)/(I_B)=4) aligned

Two rigid bodies A and B rotate with rotational kinetic energies...

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