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題組內容

18. The x-, y-, and z-components of the electric field on an EM wave in vacuum are -60.0✖ cos[(4.0 m-¹)x + wt], E_x = E₂ = 0

(a) Find the value of ω. (4%)

相關申論題

8. A force = (cx - 3x2)î acts on a particle as the particle moves along an x axis, with in newtons, in meters, and c a constant. At x = 0, the particle's kinetic energy is 20.0 J; at x = 3.00 m, it is11.0 J. Find c.

9. At time t, the vector = 4.0t²[ - (2.0t + 6.0t2)j gives the position of a 4.0 kg particle relative to the origin of an xy coordinate system ( is in meters and t is in seconds). Find an expression for the torque acting on the particle relative to the origin.

10. A uniform solid disk of radius R and mass M is free to rotate on a frictionless pivot through a point on its rim. If the disk is released from rest in the position shown by the gray-colored circle, what is the speed of its center of mass when the disk reaches the position indicated by the dashed circle?

11. Calculate the sound intensity ratio (I drill/I conversation) for a pneumatic drill at 3 m (90 dB) compared to normal conversation at 1 m (60 dB).g

12. A charge distribution that is spherically symmetric but not uniform radially produces an electric field of magnitude E = Kr4, directed radially outward from the center of the sphere. Here r is the radial distance and K isa constant. What is the volume density p of the charge distribution?

13. A conducting bar of length I rotates with a constant angular speed w about pivot at one end. A uniform magnetic fieldis directed perpendicular to the plane of rotation as shown. Find the motional emf induced between the ends of bar. xBx dr

14. An oscillator producing 10 volts (rms) at 200 rad/s is connected in series with a 50 Ω resistor, a 400mH inductor, and a 200 F capacitor. What is the rms voltage (in volts) across the inductor?

15. The magnitude of the electric field between the two circular parallel plates in the figure is E = (4.0 × 105) - (6.0 x 104t), with E in volts per meter and t in seconds. At t = 0, is upward. The plate area is 6.0 x 10-2 m². For t≥ 0, what is the magnitude of the displacement current between the plates?

16. White light, with a uniform intensity across the visible wavelength range of 400 to 690 nm, is perpendicularly incident on a water film, of index of refraction n = 1.33 and thickness L = 320 nm, that is suspended in air. At what wavelength λ is the light reflected by the film brightest to an observer?

(a) What is T3/T1? (5%)

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