20. An LRC series circuit has R = 15.0 Ω, L = 25.0 mH, and C = 30.0 μF. The circuit is connected to a 120-V (rms) ac source with frequency 200 Hz.
(A) The impedance of the circuit is 163 Ω,
(B) The rms current in the circuit is 7.16 A,
(C) The rms voltage across the resistor is 110V,
(D) The rms voltage across the inductor is 239 V,
(E) The rms voltage across the capacitor is 123 V

21.Some properties of glass are listed here.   glass window pane is 2.7 m high, 2.4 m wide, and 2.0 mm thick. The temperature at the inner surface of the glass is 22℃ and at the outer surface 4.0℃. How much heat is lost each hour through the window under steady state conditions? (A)1.7x108J,(B)4.7x104J,(C)1.7x106J,(D) 1.7 x 105 J,(E)4.7 x 101 J.

22. When an electromagnetic wave falls on a white, perfectly reflecting surface, it exerts a force F on that surface. If the surface is now painted a perfectly absorbing black, what will be the force that the same wave will exert on the surface? (A) F/2,(B) F, (C) F/4, (D)4F,(E) 2F.

23. A microwave oven operates with sinusoidal microwaves at a frequency of 2400 MHz. The height of the oven cavity is 25 cm and the base measures 30 cm by 30 cm. Assume that microwave energy is generated uniformly on the upper surface of the cavity and propagates directly downward toward the base. The base is lined with a material that completely absorbs microwave energy. The total microwave energy content of the cavity is 0.50 μJ. What is the amplitude of the electric field? (c = 3.00 x 108m/s, μ0 = 4πx 10-7 T m/A, ε0 = 8.85 x 10-12 C2/N m2)(A)  2500 V/m, (B) 1900 V/m, (C) 2200 V/m, (D) 2800 V/m, (E) 1600 V/m.

24. A 1.0-kg block and a 2.0-kg block are pressed together on a horizontal frictionless surface with a compressed very light spring between them. They are not attached to the spring. After they are released and have both moved free of the spring (A) both blocks will have equal speeds. (B) the magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block. (C) the lighter block will have more kinetic energy than the heavier block. (D) the heavier block will have more kinetic energy than the lighter block. (E) both blocks will both have the same amount of kinetic energy.

25. You need 14 W of infrared laser light power with wavelength 1270 nm to bore a hole in a diamond. How many downward atomic transitions per second must occur in the laser if all of them result in light directed onto the diamond? (c = 3.00 x 108m/s, h=6.62610-34J·s) (A)2.7 x 1018, (B) 8.9 x 1019, (C) 9.8 x1018, (D) 5.9 x 1019, (E) 1.4 x 1018

1.斜面夾角為30度，若以平行斜面之方向施力，則機械利益為： (A)2 (B) (C)3 (D)

2.下列何者不是墊片的功用？ (A)增大承壓面積 (B)防止螺帽鬆脫 (C)避免螺栓螺紋受損 (D)保護工件表面，避免受壓損痕跡

3.能使軸與輪轂同時旋轉且具有軸向的相對運動，並能傳遞極大動 力的是： (A)鞍形鍵 (B)栓槽鍵 (C)平鍵 (D)半圓鍵

4.3支相同彈簧常數為1N/mm的彈簧，先組成2支並聯之後再與1支串聯，則組成總彈簧常數為多少N/mm？ (A)1 (B)(C)(D)2

5.有關萬向聯結器之說明，下列何者錯誤？ (A)又稱虎克接頭 (B)主動軸的角速度為定值 (C)從動軸的角速度每轉轉時，即發生週期性變化 (D)從動軸角速度之比介於cosθ與之間

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