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Application: The short dipole antenna. A short dipole is a dipole that is too long to be considered a Hertzian dipole but too short to be an arbitrarily long antenna. This usually means an antenna between λ/50 to λ/10 in length. Given: In the short dipole, the current is linear: I(z') = I0(1 - (2/l)|z'|), where I = λ/20 is the total length of the dipole and 10 is constant. Calculate:
(a) The far-field electric field intensity, magnetic field intensity, and power density.
(b) The radiation resistance and radiation pattern of the dipole.
you have an electrical heater to heat-treat polymers. according to the manufacturers manual the heat flux at the
Has a diameter of Dp = 0.25 m and a height of Lp = 2 m, extending from stove to ceiling. The stove is in a large room whose air and walls are at Too = Tsur = 300 K. Neglecting heat transfer from the small horizontal sec- tion of the pipe and radia..
In theoretical (ideal) single-stage ammonia vapor-compression system, liquid leaves the condenser at 250 psia and 104 °F. Evaporator pressure is 18.30 psia. Vapor leaves the evaporator at 0°F. The system produces 25 tons of refrigeration.
a seismic instrument has a natural frequency of 20 hz and a damping ratio of 0.65. determine the maximum input
a 25 mm diameter uniform steel shaft is 600 mm long between bearings.a find the lowest critical speed of the shaftb if
Determine the equation for S as a function of θ for each type of motion. These equations should be written so that the displacement measured from the zero position can be calculated for any cam angle by use of the proper equation.
Air undergoes an isentropic process from P_1 = 100 kPA and T_1 = 300 K to a final state where the temperature is 700 K. Assuming an ideal gas, find P_2 using both the ideal gas tables and assuming a constant specific heat ratio at the average tempera..
carbon dioxide co2 contained in a piston-cylinder arrangement initially at 87 psia and 720 r undergoes an expansion to
1. Briefly explain what determines the characteristic color of (a) a metal and (b) a trans- parent nonmetal. 2. Briefly explain why some transparent materials appear colored while others are color- less. 3. Briefly describe the three absorption mecha..
What should the diameter of the nozzle outlet be in inches and what is the mass flow rate of steam through the nozzle in lbm/min?
In the velocity-pressure analogy, is the fluid inertia element analogous to the mechanical inertia element?
At steady state, a 15-W curling iron has an outer surface temperature of 90°C. For the curling iron, determine the rate of heat transfer, in kW, and the rate of entropy production, in kW/K.
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