20. What is the behavior of the current I(t) in this circuit? (A) Imax exp(-t/RC) (B) Imax(1 - exp(-t/RC)) (C) Imax exp(-t/√(RC)) (D) Imax RC/(t + RC) (E) Imax cos(2πt/RC).

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.

20. What is the behavior of the current I(t) in this circuit?
(A) I_max exp(-t/RC)
(B) I_max(1 - exp(-t/RC))
(C) I_max exp(-t/√(RC))
(D) I_max RC/(t + RC)
(E) I_max cos(2πt/RC).

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