3. Consider an extra external force cosωt acting on the mass of a damped oscillator. The phenomenon "resonance" can be seen by varying ω on what kind of oscillator?
(A)underdamped,
(B)overdamped,
(C)both kinds,
(D) neitber kind,
(E) resonance cannot be observed by varying w.

4.貝多芬的「快樂頌」的前兩個樂句，構成何種曲式結構單位？(A) 雙樂句(B)對比樂段(C)二段體(D)平行樂段

5.作曲者「白遼士」（Hector Berlioz）的代表作品為？(A)羅馬之泉 (B)畫家馬提斯(C)幻想交響曲(D)春之

1. Consider a one-dimensional system with potential energy plotted below. Whichx-u diagram correctly describes a particle with energy E1 and another particle with energy E2? (A)(B)(C)(D) (E)none of the above

2. A mass m is attached to a spring with spring constant k (the other end of the spring is Exed). The mass of the spring is negligible. When the mass moves at velocity v, there is a drag force -bu acting on the mass. Which figure describes the displacement x of the mass as a function of time for some initial condition under the condition that the oscillator is overdamped?(A)(B)(C)(D)(E) none of the above

4. Consider a small segment of a string which is under tension T. The mass density of the string is A and the length of this segment is do. Let the vertical displacement bf the string be y(x,t) and 8y/Ox be small everywhere. The vertical force acting on this segnent is (A)(B)(C)(D)(E) none of the above.

5.Which expression cannot represent a solution of the wave equation? (A)(B)(C) (D)(E) all expressions can represent a solution of the wave equation.

6. The key concepts behind Kepler's 2nd law for planetary motion (the line joining the sun to a planet sweeps out equal areas in equal times) include (A)energy conser ervation,(B)momentum conservation, (C)angular momentum conservation, (D) both (a)(b), (E) both (a)(c).

7. A rocket has a mass of 2 x 108 kg. It expels gas at the rate of 2 x 10t kg/s with an exhaust speed of 1000 m/s relative to the rocket. The initial acceleration of the rocket at the launch pad (neglect gravity) is closest to (A) 1 m/s2,(B)10m/s2, (C)100 m/s2,(D) 1000m/s2,(E)100000 m/s2.

8. Water (mass density ρ) fows at speed ui； through a garden hose with cross sectional area ao and emerges at pressure ps from a nozzle of cross sectional area a0/2. The pressure at the faucet is (A)(B) (C)(D)(E) none of the above.

9. Consider N gas molecules in a cubic box of lateral size L at temperature T. Neglect the interactions between the particles and let m be the mass of a molecule, the average nunber of particles hitting one of the bounding wals per unit time is (kB is the Boltzmann constant) (A)(B) (C) (D)(E) none of the above.