Problem based on antenna for a cellphone
Cellphones use radio waves, some at a frequency of 840.1 MHz. An efficient antenna is a quarter of a wavelength long. Such an antenna for a cellphone would have a length of (answer should be in cm). Please explain.
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Create a scatter plot for all of the US airline data with revenue passenger miles on the y-axis and load factor on the x-axis. Do the same for the individual airline you have selected.
A vertical magnetic field decreases at a rate of 57.0 mT/s. A flat circular coil of 1000 turns with a 25.0 cm diameter has a 106 uF capacitor across its terminals. If the coil is placed perpendicular to the field, what is the charge on the capacit
The true stress-strain curve of a material obeys the power-hardening law with n = 0.18. A piece of this material was given a tensile strain of e = 0.03 before being sent to a laboratory for tension testing.
A simple harmonic oscillator consists of a block of mass 3.90 kg attached to a spring of spring constant 169 N/m. When t = 3.00 s, the position and velocity of the block are x = +0.129 m and v = +3.415 m/s.
If the water is a two-phase liquid-vapor mixture, determine the quality. Ammonia at a pressure of 40 lbf/in. 2 has a specific internal energy of 308.75 Btu/lb. Determine the specific volume at the state, in ft3/lb.
The listener and the speakers are all in the same hori- zontal plane and the speed of sound is 340 m/s. [Hint: Start with determining the maximum path difference between the two waves at points on the circle.
A power plant based on the Rankine cycle is under development to provide a net power output of 10 MW. Solar collectors are to be used to generate Refrigerant 22 vapor at 1.6MPa, 50 degrees C, for expansion through the turbine.
Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.897 and the equation of the regression line isy= 1.58 + 1x, where x represents the IQ score of the twin born first.
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