5. Four stars of equal mass m rotate in a circular path of radius r about their center of mass, as shown in Fig. 3. Their connection lines form a square shape. What is the angular frequency of this rotation motion? (G is the gravitational constant.)

(A)
(B)
(C)
(D)
(E)

6. What is the correct form of the 1-dimensional wave equation? where f is dynamic variable, x is position, t is time, and v is wave velocity.(A)(B)(C)(D) (E) 

7. Assume v is the speed of sound and f₀ is its frequency. If an observer moves towards the sound source at speed v₀. What is the frequency heard by the observer? (A)(B) (C) (D)(E)

8. Which one of the following statements of the second law of thermodynamics is correct? (A) In a reversible process the entropy of an isolated system stays constant; in an irreversible process the entropy decreases. (B) In a reversible process the entropy of an isolated system increases; in an irreversible process the entropy stays constant. (C) It is impossible for a cyclical device to transfer heat continuously from a cold body to a hot body without the input of work or other effect on the environment. (D) It is possible for a heat engine that operates in a cycle to convert its heat input completely into work. (E) Every cyclical heat engine has a greater efficiency than a reversible engine operating between the same two temperatures.

9. Consider the adiabatic free expansion of an ideal gas system. The initial volume, pressure, and temperature are Vᵢ, Pᵢ, and Tᵢ, respectively. The final volume, pressure, and temperature are Vf, Pf, and Tf, respectively. What is the change in entropy ΔS of the gas? (Assume N is the number of molecules and k_B is Boltzmann's constant.) (A) ΔS = Nk_B ln(Vf/Vᵢ) (B) ΔS = Nk_B ln(Pf/Pᵢ) (C) ΔS = Nk_B ln(Tf/Tᵢ) (D) ΔS = Nk_B (Pf/Pᵢ) (E) ΔS = Nk_B (Tf/Tᵢ)

10. As shown in Fig. 4, three charges of -q, +q, and +q are situated at the corners of a regular triangle with side length s. How much work does it take to assemble the whole configuration of these charges? (A)  (B) (C) (D) (E)

11. There is an infinite dielectric slab lying on the x-y plane, which has an uniform polarization P along the z-direction, as shown in Fig. 5. The thickness of the slab is d. What is the electric field inside the dielectric slab? where P = |P| is the magnitude of the polarization, and eₓ, eᵧ, and eₓ are the unit vectors along x, y, and z-axes.  (A) -Pdε₀eₓ (B) (C) (D) (E)  

12. The Fig. 6 shows the cross section of a long cylindrical conductor with radius a, which contains a long cylindrical hole of radius b. The central axes of the cylinder and the hole are parallel and are distance d apart. Current density j is uniformly distributed in the conductor with its direction along the z-axis. What is the magnetic field B in the hole? where j = |j| is the magnitude of the current density, and eₓ, eᵧ, and eₓ are the unit vectors along x, y, and z-axes. (A) (B) (C) (D) (E)

13. A parallel plate capacitor has rectangular plates of area A = 5 (cm²) separate by distance d = 0.5 (mm). If the potential difference between the plates changes at a rate of 10⁴ (volt/sec), what is the displacement current? (permittivity of vacuum ε₀ = 8.854 × 10⁻¹² (F/m)) (A) 8.854 × 10⁻⁴ (amp) (B) 4.427 × 10⁻⁸ (amp) (C) 1.771 × 10⁻⁷ (amp) (D) 4.427 × 10⁻⁷ (amp) (E) 8.854 × 10⁻⁸ (amp)

14. Consider a spherical capacitor which consists of two concentric conducting spheres. The radii of the inner and outer spheres are R₁ and R₂, respectively. What is its capacitance? (A) (B) (C)(D)(E)

15. A 10-kW radio antenna transmits at 100 MHz. Assume it radiates as a point source. Find the radiation pressure at a distance of 20 km. (A) 1.5 × 10⁻¹⁶ (Nt/m²) (B) 4.8 × 10⁻¹⁶ (Nt/m²) (C) 1.5 × 10⁻¹⁵ (Nt/m²) (D) 3.3 × 10⁻¹⁵ (Nt/m²) (E) 6.6 × 10⁻¹⁵ (Nt/m²)

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