9. Two balls, projected at different times so they don’t collide, have trajectories A and B, as shown below. Which statement is correct?
(A) v _0B must be greater than v _0A.
(B) Ball B is in the air for a longer time than ball A.
(C) Ball A is in the air for a longer time than ball B.
(D) Ball B has a greater acceleration than ball A.
(E) Ball A has a greater acceleration than ball B.

5. A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0 , it has charge of magnitude Q0 on its plates. While it is connected to the battery, the space between the plates is filled with a material of dielectric constant 3. After the  dielectric is added, the magnitude of the charge on the plates and the potential difference between them are (A) (B) (C) (D) (E)

6. To decrease the intensity of the sound you are hearing from your speaker system by a factor of 36, you can (A) reduce the amplitude by a factor of 18 and increase your distance from the speaker by a factor of 2. (B) reduce the amplitude by a factor of 4 and increase your distance from the speaker by a factor of 3. (C) reduce the amplitude by a factor of 2 and increase your distance from the speaker by a factor of 3. (D) reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 12. (E) reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 4.

7. If an R = 1 kΩ resistor, a C = 1 µF capacitor, and an L = 0.2 H inductor are connected in series with a V = 150 sin (377t) volts source, what is the maximum current delivered by the source? (A) 0.007 A (B) 27 mA (C) 54 mA (D)0.0308mA(E)0.34A

8. In which process will the internal energy of the system NOT change? (A) An adiabatic expansion of an ideal gas. (B) The evaporation of a quantity of a liquid at its boiling point. (C) An isothermal compression of an ideal gas. (D) An isobaric expansion of an ideal gas. (E) The freezing of a quantity of liquid at its melting point. 

10. A binary star system in the constellation Orion has an angular separation between the two stars of 1.2 × 10-5radians. If λ = 5 × 10–7 m, what is the smallest aperture (diameter) telescope that may be used to resolve the two stars? (A) 10 cm (B) 5 cm (C) 50 cm (D) 1 m (E) 4 m

11. We wish to coat flat glass (n=1.5) with a transparent material (n=1.25) so that reflection of light at wavelength 600 nm is eliminated by interference. What minimum thickness can the coating have to do this? (A) 30 nm (B) 100 nm (C) 120 nm (D) 400 nm (E) 480 nm

12. The figure shows a circuit that contains three identical resistors with resistance R=9.0Ω, two identical inductors with inductance L=4.0 mH, and an ideal battery with emf ξ=36 V. IA is the current just after the switch is closed, and IB is the current through the battery long after the switch has been closed. What is the current ratio IA/IB? (A) 1/3 (B) 1/2 (C) 1 (D) 2 (E) 3

13. A long cylindrical wire (radius = 2.0 cm) carries a current of 40 A that is uniformly distributed over a cross section of the wire. What is the magnitude of the magnetic field at a point which is 1.5 cm from the axis of the wire? (A) 0.53 mT (B) 28 mT (C) 0.30 mT (D) 40 mT (E) 1.9 mT

14. The average position, or expectation value, of a particle whose wave function ψ(x) depends only on the value of x, is given by ＜ x＞ = ? (A) (B) (C) (D) (E)

15. A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250 °C and 25 °C, what is its maximum thermodynamic efficiency? (A) 43% (B) 56% (C) 65% (D) 83% (E) 90%