6. An ideal heat engine can have an efficiency of 100% if the temperature of the low temperature reservoir is
(A) 0°F.
(B) 0℃.
(C) 10 K.
(D) 0K.
(E) the same as the temperature of the heat source.

7. The reason that we can calculate the change in entropy of a system is that, (A) entropy always increases. (B) entropy always decreases. (C) systems always follow irreversible paths. (D) it depends only on the properties of the initial and final equilibrium states. (E) systems always follow reversible paths.

8. If n moles of an ideal gas are expanded isothermally from an initial volume V1 to a final volume V2, the change in entropy is (A) nRT In (V2/V1), (B) nR In (V2 /V1), (C) nkB In (V2/V1), (D) n Cp ∫dT/T, (E) n Cp/T.

9. A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 sin (πt + π/3). The velocity (in m/s) of the body at t = 2.0 s is (A)+8.0, (B) -8.0, (C) -5.0, (D) -14.0, (E) +14.0.

10. Calculate the average power needed to spin a uniform, solid disk of mass 2.2 kg and radius 0.70 m from rest to 10.0 rad/s in 2.3 s.(A)9.2W,(B)11.6 W, (C) 14.0 W, (D) 12.0 W, (E) 16.4 W.

11. Two long, parallel wires, separate by 10 cm. One carries a current of 5.0 A and another carries a current of 10,0 A in the opposite direction. Which of the following statements is true?(A) In region 1, the magnetic field is into the page and is never zero. (B) In region 2, the field is into the page and is never zero. (C) In region 3, the magnetic field is into the page and is never zero. (D) In region 3, the magnetic field is out of the page and can be zero. (E) There are no points where the field is zero.

12. A loop of wire locates at the upper side of a long wire carrying currents of 5A. When the loop falls down toward the wire at the speed ofy, what is the direction of force exerted on the loop by the long wire at this moment?(A) upward, (B) downward, (C) left, (D) right, (E) impossible to determine.

13. A Wi-Fi signal uses 5GHz frequency band for electromagnetic sinusoidal wave transmission. When the amplitude of electrical field of the EM wave is 6 V/m, what is the wave function of magnetic field B(x,t)? (u0 = 4π✖ 10-7 N/A2,ε0 = 8,85✖ 10-12F/m). (A) 5 X 107 cos(16.67x-3.14✖1010t).(B)5 X 107 cos(104.72x-3.14✖1010t). (C)2X10-8cos(16.67x-3.14✖1010t).(D)2X10-8co(104.72x-3.14X1010t). (E)0.17cos(16.67x-3.14X1010t).

14. A plane electromagnetic (EM) sinusoidal wave propagates in the x direction. Suppose the wavelength is 500.0 nm and the electrical field has an amplitude of 300.0 V/m. What is the intensity (average of poyting vector) of this EM wave (uo = 4π X 10-7N/A2,ε0= 8.85x10-12 F/m) (A)477.5 J/s.m2, (B) 337.6 J/s.m2, (C) 238.7 J/s.m2 , (D) 168.8 J/s.m2, (E) 119.4 J/s.m2.

15. The switch of this circuit is closed at t=0, what is the voltage across capacitor (Vc) after a long time (>> time constant) when the capacitor and inductor are in the steady state? (A) IV, (B) 2V, (C) 3V, (D) 4V, (E) 6V.

16. A particle with charge IC is at the origin (x = 0.0 m). A particle with charge -4C is at x = 2.0 m on the x axis. What finite value(s) of x is the electric potential zero? (A) -2 and -2/3, (B) -2 and 2/3, (C) -2/3 and 2/3, (D) -2/3 and 2/5, (E) 2/3 and 2/5.

115年 - 115 台灣聯合大學系統_學士班轉學考試_A3／A6：普通物理#142629

115年 - [無官方正解]115 國立臺灣大學_轉學生招生考試試題：普通物理學(A)#142625

115年 - 115 台灣聯合大學系統_碩士班招生考試_物理類：普通物理#139676

115年 - [無官方正解]115 國立中山大學_碩士班考試入學招生考試試題_物理系：普通物理#138395

115年 - [無官方正解]115 國立臺灣大學_碩士班招生考試：普通物理學#137725

114年 - 114 國立嘉義大學_轉學生招生考試試題：普通物理#143735

114年 - [無官方正解]114 國立成功大學_碩士班招生考試_物理學系：普通物理學#138760

114年 - [無官方正解]114 國立中山大學_碩士班招生考試試題_物理系：普通物理#137736

114年 - 114 台灣聯合大學系統_碩士班招生考試：普通物理#137733

114年 - [非官方正解]114 臺灣綜合大學系統_學士班轉學生聯合招生考試試題：普通物理Ａ#129365