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Consider a cell phone that emits electromagnetic radiation with a frequency of 1.0 GHz and with a power of 70 W.
(a) What is the electric field amplitude at a distance 1020 m away from the phone? Assume it radiates as a point source.
(b) If your ear is only about 10 cm from the source of radiation, what is the electric field amplitude at your ear as you use the phone? Again assume the phone radiates as a point source.
A cube of edge length l = 3.80 cm is positioned as shown in Figure P30.35. A uniform magnetic field given by B = (5.50 i + 4.00 j + 3.00 k) T , Calculate the flux through the shaded face
A positive charge of 0.900? C is located in a uniform field of 1.05×105 N/C. How close are the two charges
A parallel-plate capacitor has a capacitance of c1 = 5.5 ?F when filled with air and c2 = 33 ?F when filled with a dielectric oil at potential difference of 12 V, Input an expression for the permittivity of the oil
Two heavy pendula of mass m are suspended from strings of length l inside a railroad car of mass M that can roll freely on horizontal tracks (ignore the moment of inertia of the wheels).
A block with mass m = 5.00kg slides down a surface inclined 36.9 ? to the horizontal (the figure (Figure 1) ). The coefficient of kinetic friction is 0.27. What is the acceleration of the block down the plane
A field mouse trying to escape a hawk runs east for 6.0m , darts southeast for 3.9m, What is the magnitude of the net displacement of the mouse
Calculate the labour price (rate) variances for each worker level. b. Compute the labour efficiency variances for each worker level. c. Compute the labour mix variances for each worker level.
The pressure and volume of this gas are kept constant, while the number of molecules is doubled. Illustrate what is the final translational rms speed of the molecules?
A sealed 62 m3 tank is filled with 6000 moles of ideal oxygen gas (diatomic) at an initial temperature of 270 K. find the mass density of the oxygen gas
A magnifier has a magnification of 8 times. How far from the lens should an object be placed so that its (virtual) image is at the near-point distance of 25 {rm cm}.
95.8 kg of ice is melted into water then raised to a temperture of 325.8 K. How much energy is needed to complete this process?
A projectile is launched from a cannon at ground level at an angle of 62.0 degrees elevation and has a muzzle velocity of 481 m/s. Explain how many seconds after it is fired does it reach max height?
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