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• 3. In a sinusoidal-ac circuit, the current is I=I0sin(ωt +θ) . What is the rms(root-mean-square) cur
• 54. The following organism with the greatest number of Hox genes should be a(n)(A) fish. (B) fly. (C
• 2. A long solenoid of 500 turns carrying a current of 3.8 A produces within itself a uniform magneti
• 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