5. A uniform string of linear mass density μ and length L hangs vertically under gravity. How long does it take a wave to propagate from the bottom to the top of the string? (A) L/√(μg) (B) L√(μ/g) (C) 2π√(L/g) (D) √(L/g) (E) 2√(L/g).

10. An electric dipole consists of two opposite charges, each with mass m and charge ±q (respectively), and the two charges are separated by a distance d. Under a uniform external electric field E, the electric dipole performs simple harmonic oscillation if the angle between the dipole and E is small. The period of this oscillation is (A) (B) (C) (D)(E) none of the above.

5. A uniform string of linear mass density μ and length L hangs vertically under gravity. How long does it take a wave to propagate from the bottom to the top of the string?
(A) L/√(μg)
(B) L√(μ/g)
(C) 2π√(L/g)
(D) √(L/g)
(E) 2√(L/g).

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