資訊推薦

• 5. A sample of 770 mol of nitrogen gas is maintained at a constant pressure of 1.00 atm in a flexibl
• 4. A cylinder of mass 10.0 kg rolls without slipping on a horizontal surface. At the instant when it
• 16.右圖為均佈荷重的簡支樑，下列何者不是最大力矩(moment) M 的所在位置？(A)剪力為零處(B) dM / dx = 0 處(C)左方支點處(D)樑的中央處
• 6. A 1.00-kg mass is attached to a horizontal spring. The spring is initially stretched by 0.100 m a
• 7. What is the absolute pressure at the bottom of a lake that is 30.0 m deep, when the air pressure
• 9. Suppose that the temperature at the center of the Sun is 2.00×107 K, what is the average translat
• 11.When radiation of wavelength 350 nm is incident on a surface, the maximum kinetic energy of the p
• 10. A nonconducting sphere of radius 10 cm has charge uniformly distributed throughout its volume. T
• 8. A magnetic field given by B（t）=0.2t - 0.5t2 T is directed perpendicular to the plane of a circula
• 14. An important observation that led Bohr to formulate his model of the hydrogen atom was the fact
• 15. If the peak electric field in an electromagnetic wave is 1200 V/m , what is the peak magnetic fi
• 12. An electron in the hydrogen atom makes a transition from the n=5 level to the n=2 level. What is
• 13. A proton is projected toward a fixed nucleus of charge +Ze with velocity V0 . Initially the two
• 17. Electromagnetic standing waves are set up in a conducting cavity resonator in the form of a holl
• 16. The square plates of a 9000 pF capacitor measure 90 mm by 90 mm and are separated by a dielectri
• 18. The potential energy function of a particle moving in one dimension is U=kx2e−x2/a2where  a = 7.
• 20. A 1.0µF capacitor with an initial stored energy of 0.50 J is discharged through a 1.0 MΩ resisto
• 19. A proton with speed  v = 3.00×105m/s orbits just outside a charged sphere. The radius of the orb
• 21. A hollow sphere of inner radius 8.0 cm and outer radius 9.0 cm floats half-submerged in a liquid
• 23. A girl is sitting near the open window of a train that is moving at a velocity 10.00m/s to the e
• 24. Two point charges q1=2.1×10-8C and q2 = −4q1 are fixed in two places 50 cm apart. The point char
• 22. Three sinusoidal waves of the same frequency travel along a string in positive direction of an x
• 1.於道路施作自來水管埋設，有關作業安全與交通維護，下列何者不是應有之設置？(A)圍籬 (B)拒馬 (C)夜間警示燈 (D)攝影裝置
• 25. A 5.0 g marble is fired vertically upward from a spring gun. The spring must be compressed 8.0 c
• 【題組】46.接續第 45 題，下圖所示為輸入電壓對輸出電壓，第 I 區電晶體工作區域為？ (A)QN: off、QP: off (B)QN: off、QP:三極體 (C)QN:三極體、QP: off