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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.
if the load has a weight of 200kn determine the xyz components of reaction at the ball and socket joint a and the
A 400 L rigid tank contains 5 kg of air at 25 degrees C. Determine the reading of the pressure gauge if the atmospheric pressure is 97 kPa.
Calculate the load capacity of a precast concrete pile that is 14in. in diameter and is driven into soil resistance of 2.5 tons per square foot. Assume the top 5 feet of the pile cannot develop any shear resistance. Total pile length is 35 feet.
a tensile force of 8 kn is applied to the ends of a solid bar of 7.35 mm diameter. under load the diameter reduces to
locate the initial and final states on a sketch of the T-v digram. determine the mass of vapor present at the initial and final state, each in kg.
liquid propane is commonly used as a fuel for heating homes powering vehicles such as forklifts and filling portable
an air-standard otto cycle uses 0.1 kg of air and has a clearance of 17%. THe intake conditions are 98 kPa and 37 C and the energy released during combustion is 1600 KJ/kg. What is the compression ratio of the cycle?
the temperature profile at a location in water flowing over a flat surface is experimentally measure to be tdegc
the critical heat flux of water at 1 atm is qmax 1258.7 kwm which occurs at ?t 30c. boiling enters the transition
consider an oblique shock wave with a wave angle of 30 degree. the upstream flow mach number is 2.4 calculate the
A vertically mounted piston-cylinder device contains 1.5 kg of water and is being heated over a coal burning stove. During the process, 75 kJ of heat is transferred to the water and heat losses from the side walls amount to 9 kJ.
per the linked problem i dont understand how the shear calculation is done. why is vf and vb 333.33 lb.ft? i understand
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