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An octave is defined as a doubling of the frequency. The claim is made that a low-pass Butterworth filter of order n has a roll-off (attenuation) of 6n dB/octave. Calculate the gain in dB for a second-order filter for the cut-off frequency itself, and for three octaves above the cut-off frequency, i.e., for f/f cut off = 1, 2, 4, and 8. Then determine the roll-off in dB per octave. Does the calculated roll-off agree with the stated value of 6n dB/octave? Is the agreement better for low frequencies or high frequencies? Repeat for filters of order 4 and 6.
You are a pilot of a plane fighting a forest fire, you are flying 1000ft above the ground at a speed of 90 miles per hour and are going to drop a 5000 pound load of fire suppressing chemicals onto the fire, how far from the front line of the fire mus..
suppose that 1 kg of saturated water vapor at 100ordmc is condensed to a saturated liquid at 100ordmc in a
why is it easier to exhale than to inhale in order to blow out a candle? how is it related to laminar flow or steady
consider a flow of air in a duct assume standard atmospheric pressure at 5000 ft altitude p12.228psi. at section 1 the
a rigid copper tank initially containing 1 m3 of air at 295 k carrying air at 295 k 15 bar is connected by a valve to a
How many times more ignition energy is required to achieve ignition of a fuel-air mixture at sea level with T = 298 K than at altitude of 6000 m where pressure P = 47,166 Pa and T = 248 K?
a 70 meter tall cylindrical tower with outer diameter 12 meters is exposed to a very cold evening where the temperature
1.49 kilograms of water in a container have pressure of 200 kpa and temperature of 500 celsius. What is the volume of this container? Round to 3 decimal places and v must be in m^3
the third and fourth stages of a rocket are coasting in space with a velocity of 15000 kmh when the fourth-stage engine
at 60oc the surface of water is .0662nm and that of mercury yis .47nm. determine the capillary height changes in these
A four-stroke engine has a total displacement volume of 10L, 125mm bore and 16.3:1 compression ratio. The engine produces a maximum of 210 kW at 2100 RPM. The intake air is at 45 degrees C and 22.5 g/s of air flow into each cylinder. Calculate the vo..
a tank is fitted with an electrical resistor holds 2 kg of nitrogen n2 initially at 27 degree c 100 kpa. over a period
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