5. A violin is played with an initial intensitywhat is the difference in sound intensity level (dB) between these two extremes?
(A) 10(log5)
(B) 5
(C) 10
(D) 10(log2)
(E) 2(log5) 

5. A violin is played with an initial intensity  Ii  changing to a final intensity If. If If = 5 Ii , what is the difference in sound intensity level (dB) between these two extremes? (A) 10(log5) (B) 5 (C) 10 (D) 10(log2) (E) 2(log5)

6. An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 15 °C and the temperature below the surface is 5 °C? (A) 96% (B) 67% (C) 31% (D) 17% (E) 3.5%

7. If 10 kg of ice at 0 oC is mixed with 100 kg of water at 80 oC and is additionally heated with 4620 kJ, what is the final temperature of the water? (The heat capacity constant of water is 4.2 kJ∙kg-1 ∙K -1 , and the latent heat of fusion of water is 333 kJ∙kg-1 .) (A) 45 oC (B) 55 oC (C) 65 oC (D) 70 oC (E) 75 oC

8. Some species of whales can dive to the depth of one kilometer. What is the approximate total pressure they experience at this depth? (ρsea = 1020 kg/m3 and 1 atm =1.01 ×105 N/m2 ) (A) 9.00 atm (B) 90.0 atm (C) 100 atm (D) 111 atm (E) 130 atm

9. A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25 T magnetic field. What total distance does this proton travel during a 1.0 s time interval? (mp = 1.67×10-27 kg, q = 1.6× 10-19 C) (A) 82 km (B) 59 km (C) 71 km (D) 48 km (E) 7.5 km

10. A current loop freely rotates in a uniform magnetic field (B = 0.50 T). The maximum torque on the loop is 0.60 N ∙ m. What is the magnetic dipole moment of the loop? (A) 1.2 A·m 2 (B) 2.4 A·m 2 (C) 0.60 A·m 2 (D) 0.30 A·m 2 (E) 0.83 A·m 2

11. A 2.0 kΩ resistor and an initially uncharged 6.0 μF capacitor are connected in series to a 12 V battery. A switch is closed to complete the circuit at t = 0. What is the voltage across the resistor at t = 1.0 s? (A) 0 V (B) 12 V (C) 6 V (D) 3 V (E) 9 V

12. A 3 μF capacitor is connected in series with a 6 μF capacitor. When a 300 V potential difference is applied across this combination, the total energy stored in the two capacitors is ______. (A) 0.09 J (B) 0.18 J (C) 0.27 J (D) 0.41 J (E) 0.81 J

13. A magnetic field is directed out of the page. Two charged particles enter from the top and take the paths shown in the figure. Which statement is correct? (A) Particle 1 has a positive charge and particle 2 has a negative charge. (B) Particle 1 has a negative charge and particle 2 has a positive charge. (C) Both particles are negatively charged. (D) Both particles are positively charged. (E) The direction of the paths depends on the magnitude of the velocity, not the sign of the charge

14. In radioactive decays, which of the following statements is incorrect? (A) The energy, momentum, electric charge, and number of nucleons must be conserved. (B) In gamma decay, electromagnetic photons are emitted when a nucleus undergoes a transition from a higher to lower energy. (C) In beta decay, an electron (e- ) or a positron (e+ ) can be emitted by a nucleus. (D) In positron (e+ ) decay, annihilation radiation is generated with different photon energies. (E) The alpha decay is usually observed in the heavy unstable nuclei.

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