11. In a binary star system, Star A, which has triple the mass of Star B, orbits their common center of mass in circular patbs. Without external forces, what is the relationship between their orbital periods according to Newton's law of universal gravitation?
(A) Star A's period is 1/ of Star B's.
(B) Star A's period is the same as Star B's.
(C) Star A's period is times Star B's.
(D) Star A's period is twice Star B's.
(E) Star A's period is half of Star B's.

7. What is the approximate temperature in Kelvin (order of magnitude is fine) corresponding to an energy of leV? (Given: Boltzmann's constant = 1.38 x 10-23 J/K, e = 1.60 x 10-19 coulomb) Choose from: (A) 10K, (B) 100K, (C) 1,000K, (D) 10,000K, (E) 106 K.

8. Which of the following statements about thermodynamic processes is correct? (A) An isentropic process is the same as an adiabatic process. (B) During isothernal expansion, the system releases heat. (C) In an adiabatic compression process, the temperature of the gas increases. (D) In a constant-volume pressurization process, the work done by the system is positive. (E) A substance at high temperature, high pressure, and high density can be approximated as an ideal gas.

9. A mass m object moves along a circular path with radius R in a vertical plane . At the beginning it locates at the bottom with an initial speed , Ignoring air resistance, the speed v of the object at the top of the path is: (A) (B)(C)(D)(E) V..

10. A ballistic pendulum, a device for measuring the speed of a bullet, consists of a block of wood suspended by cords. When the bullet is fired into the block, the block is free to rise. How high does a 5.0 kg block rise when a 12 g bullet traveling at 350 m/s is fired into it?(A) 5.4 cm, (B) 24 cm, (C) 3.6 cm, (D) 36 cm, (E) 12cm.

12. What is the restoring constant (torsional constant) for a disk of mass 3.0 kg and radius 0.20 m oscillating with a period of 2.0 s? (A) 7.87 Nㆍm, (B) 0.24 Nㆍm, (C) 0.59 Nㆍm, (D) 1.12 Nㆍm, (E) 3.56 N ㆍm.

13. A 1.2 kg croquet ball moving at t2.0 m/s is struck from bebind by the impulse force shown in Figure 7. What is the final velocity of the croquet ball? (A) 0.3 m s-1, (B) 10.3 m s-1, (C) 20.3 m s-1, (D) 30.3 m s-1, (E) 40.3 m s-1,

14. Given that the Earth's radius is 6400 km, the escape velocity at the Earth's surface is (A) 1.1 x 103ms-1, (B) 1.1 x 10*ms-1, (C) 2.2 x 104ms-1, (D) 1.1 X 105 m s-1, (E) 5.0 X 105 m s-1.

15. An LC circuit, as shown in the diagram, reaches a certain state a moment after being energized. The circuit bas an inductance value of L = 4 Wb/A and a capacitance value of C= 4 A . s/V, with the assumption that the circuit's resistance can be ignored. Under these conditions, the circuit will ultimately exhibit: (A) no current flow. (B) oscillating current with a period of 16 seconds. (C) oscillating current with a period of 3.14 seconds. (D) oscillating current with a period of 12.56 seconds. (E) oscillating current with a period of 25.12 seconds.

16. A circular ring with a diameter of 20 cm and a resistance of 0.01 Ω is subject to a uniform magnetic field of 2.0 T. Calculate the amount of chatge that will flow through the ring when it is rotated from a position perpendicular to the magnetic field to one that is parallel to the field. (A) 3.14 C, (B) 6,.28 C, (C) 2.50 C, (D) 4.62 C, (E) 10 C.

17. A coil with an inductance of 1.5 H and a resistance of 0.6 Ω is suddenly connected to a 12-V battery. Determine the time it takes for the current in the coil to reach 0.63 of its final value. (A) 0.5 s, (B) 1.0 s, (C) 2.5 s,(D) 4 s, (E) 5 s.