21. What is the maximal current I_max in this circuit? (A) Q₀/LC (B) Q₀/√(LC) (C) Q₀L/C (D) Q₀C/L (E) none of the above.

8. Consider a cube of density ρ and horizontal cross-sectional area L² with vertical height L. The cube is floating in a liquid with density ρ_L. At equilibrium a fraction L₀/L of the cube is immersed in the liquid. Now let's push down the cube a little bit and release it. What is the period of the subsequent oscillation? (A) (B)(C)(D)(E) none of the above.