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A 500-kHz uniform plane wave propagates beneath the earth's surface. The amplitude of the - E field just beneath the surface is 120 V/m. If the relative permeability, the dielectric constant, and the conductivity of the earth are taken as 1, 16, and 0.02 S/m, respectively, determine (a) the propagation, attenuation, and phase constants, (b) the phase velocity, (c) the wavelength, (d) the intrinsic impedance, (e) the skin depth, and (f) the average power density. If the range is considered to be the distance at which 90% of the wave is attenuated, find the range of the signal being transmitted.
A 50 hp motor with an efficiency of 0.80 is to be replaced by a newer model motor with an efficiency of 0.90. The motor is expected to operate 3000 hours per year. The cost of electricity in our area is $0.06 per kWhr.
two large water reservoirs are connected by 8000 ft of schedule 40 steel pipe. the level of one reservoir is 500 ft
a solar thermal engine operating between 20 degrees celsius and 200 degrees celsius has efficiency equal to one-half of
Explain the need for excess air - Determine the actual fuel - Determine the composition of the flue gases by volume
A piston-cylinder device holds 2 kg of refrigerant fluid R-134a, initially at 500 KPa. At this state, 0.5 kg of the fluid is in the liquid phase. Heat is then added to the fluid at constant pressure to increase its temperature to 60 c.
the beam is to be hoisted using two chains if the resultant force is to be 600n directed along the positive y axis
a turbine is operated with an enthalpy at entrance of 1340 btulbm and an exit enthalpy of 1285 btulbm. if the entrance
a friction less piston-cylinder device initially contains 50 l of saturated liquid refrigerant-134a. the piston is free
The exposed surface (x = 0) of a plane wall of thermal conductivity k is subjected to microwave radiation that causes volumetric heating to vary as where q"0 (W/m3) is a constant. The boundary at x = L is perfectly insulated, while the exposed sur..
25 Superheated steam at 20 MPa, 560 degree C enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.5 bar, and liquid leaves the condenser at 0.4 bar at 75 degree C.
1.8 ft3lb of ammonia at 130f is a two-phase liquid-vapor mixture. determine the quality of a two-phase liquid mixture
1. what are dynamic and kinematic viscosities?2. what is shear stress?3. what is the reynolds number and why is it
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