A uniform circular disk of mass m = 24.0 g and radius r = 40.0 cm hangs vertically from a fixed, frictionless, horizontal hinge at a point on its circumference as shown in Figure P34.39a. A beam of
Figure 34.39
Trending nowThis is a popular solution!
Chapter 34 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
- The electric part of an electromagnetic wave is given by E(x, t) = 0.75 sin (0.30x t) V/m in SI units. a. What are the amplitudes Emax and Bmax? b. What are the angular wave number and the wavelength? c. What is the propagation velocity? d. What are the angular frequency, frequency, and period?arrow_forwardFigure P24.13 shows a plane electromagnetic sinusoidal wave propagating in the x direction. Suppose the wavelength is 50.0 m and the electric field vibrates in the xy plane with an amplitude of 22.0 V/m. Calculate (a) the frequency of the wave and (b) the magnetic field B when the electric field has its maximum value in the negative y direction. (c) Write an expression for B with the correct unit vector, with numerical values for Bmax, k, and , and with its magnitude in the form B=Bmaxcos(kxt) Figure P24.13 Problems 13 and 64.arrow_forwardA parabolic reflector focuses electromagnetic waves into a beam as shown in the figure. The electromagnetic radiation is pulsed, with a pulse frequency of 11.0 GHz, and the duration of each pulse is t = 1.00 ns. The face of the reflector has a radius of 3.50 cm, and the average power during each pulse is 29.0 kW. (Due to the nature of this problem, do not use rounded intermediate values in your calculations-including answers submitted in WebAssign.) D (a) What is the wavelength (in cm) of these electromagnetic waves? cm (b) What is the total energy (in μJ) contained in each pulse? µJ (c) Compute the average energy density (in m3/m³) inside each pulse. mJ/m³ (d) Determine the amplitude of the electric field (in kv/m) and magnetic field (in µT) in these electromagnetic waves. Emax = Bmax = kv/m PT (e) Assuming that this pulsed beam strikes an absorbing surface, compute the force (in µN) exerted on the surface during the 1.00 ns duration of each pulse. μNarrow_forward
- A laser can suspend a small glass sphere in Earth's gravitational field, g = 9.80 m/s2. Assume that the suspended sphere is made of perfectly absorbing black glass. The sphere has a radius of 0.560 mm and a density of 0.190 g/cm3. Determine the radiation intensity needed to keep the small glass sphere suspended. (answer in kW / cm^2)arrow_forwardAn electromagnetic wave from a wire antenna travels (from the reader) toward the plane of the paper. At time t = 0.0 s it strikes the paper at normal incidence. At point O and t = 0.0 s, the magnetic field vector has its maximum value, 5.01×10-8 T, pointing in the negative y-direction. The frequency of this wave is 1.17×106 Hz.What is the y component of the magnetic field at point O at time 4.27×10-7 s?arrow_forwardA sinusoidal electromagnetic wave propagates in the +x direction through empty space. Its electric field is described by E = (2.02E4 V/m) × sin ((2.06E11 rad/s) t – (687 rad/m) x ) . What is the magnetic field amplitude of this electromagnetic wave (in T)?arrow_forward
- An electromagnetic wave E = (2) sin (2π (8.1910 x 105 GHz) t- z+ (0.5000 rad)) travels along z-axis of a right-handed system of coordinates. Angle between the x-axis and the positive (+) direction of electric field oscillation is 0 = 0.9817 rad. What are the electric field strength and x,y,z- components of the electric field vector at position t = 6 fs and when z = 602 nm ? E * Z What is the electric field strength? E=1 Your last answer was interpreted as follows: 1 What is the x-component of the electric field vector? E₂ = 1 Your last answer was interpreted as follows: 1 What is the y-component of the electric field vector? E₂ = 1 Your last answer was interpreted as follows: 1 What is the z-component of the electric field vector? E₂=1 Your last answer was interpreted as follows: 1 Do not leave any fields blank. If you don't know the answer, insert 1 for example. Insert the answer with 3 significant digits without rounding the answer. Unit Constant Value c 2.9979 × 10 Quantity…arrow_forwardA linearly polarized electromagnetic wave has an average intensity of 291 W/m2. This wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). Polarizer A is oriented with its transmission axis at an angle of 0₁ = 29.9° with the incident electric field. Polarizer B has its axis at an angle of 0₂ = 74.6° with the incident electric field, as shown in the figure. .0₂ View Along Axis Sideview What is the average intensity of the wave after it passes through polarizer A? What is the average intensity of the wave after it passes through polarizer B? Suppose that the two polarizers A and B are interchanged. What would the average intensity be after passing through both polarizers?arrow_forwardAn electromagnetic wave of wavelength 435 nm is traveling in a vacuum in the -z-direction. The electric field has an amplitude 2.70 x 10-3 V/m and is parallel to the x-axis. What are (a) the frequency and (b) the magnetic-field amplitude?arrow_forward
- An electromagnetic wave from a wire antenna travels (from the reader) toward the plane of the paper. At time t = 0.0 s it strikes the paper at normal incidence. At point O and t = 0.0 s, the magnetic field vector has its maximum value, 3.79x108 T, pointing in the negative y-direction. The frequency of this wave is 1.37x106 Hz. B (t=0) What is the x-component of the associated electric field E at time t = 0.0 s? (Use the right-hand rule to determine the direction of E, and hence the sign of the x-component.) Submit Answer Tries 0/10 What is the maqnitude of the Poynting vector of the wave at time t = 0.0 s? Submit Answer Tries 0/10 What is the y component of the magnetic field at point O at time 3.65x107 s? Submit Answer Tries 0/10arrow_forwardA planar electromagnetic wave is propagating in the -x direction. At a certain point P and at a given instant, the electric field of the wave is given by E = (1.27 V/m) ĵ. What is the magnitude and direction of the magnetic field vector of the wave (in nT) at the point P at that instant? Denote the +z direction as positive, and the -z direction as negative. (Use c = 2.9979 × 108 m/s) nTarrow_forwardLight with an intensity of (5.4x10^0) kW/m² falls normally on a surface and is completely reflected. What is the radiation pressure in μPa. Use two significant figures for your answer. Note: Your answer is assumed to be reduced to the highest power possible.arrow_forward
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning