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A hydrogen/oxygen fuel cell operates with a voltage of 0.7 V with water vapor production. Calculate the kW/h of work per kg-mol of hydrogen and determine the cell efficiency.
White noise has a constant level when measured in frequency bands of constant width. Suppose a noise generator produces white noise over the octave bands 0.5,1,2,4,8 khz. Find the overall un weighted and a-weighted sound pressures if a sound pressure..
A model rocket is launched from point A with an initial velocity v0 of 86 m/s. If the rocket's descent parachute does not deploy and the rocket lands 104 m from A
a 2.5 hp motor is used to move an 200lbf object across a horizontal surface at a velocity of 22 fts in a time period of
Using photo coordinates for points 4 and GYM on image 5, determine the scale of the photo.
A vessel of volume V = 10m^3 contains carbon dioxide under a pressure of p1 = 1 atm and at temperature of T1 = 273K. As a result of heat transfer to the gas, its temperature increases to T2 = 793K. The volume-specific heat of the gas at constant volu..
a 1-m3 rigid tank initially contains air at 150 kpa 300 k. the tank is connected through a valve to a supply line at
the potential for air pollution by particulate matter pm2.5 andor pm10 is best assessed by constructing the terminal
air expands from 100kpa 40 degrees c with volume .75 m3 to 15kpa in a polytropic process with polytropic exponent n.
The packages are placed on the belt so that they are in contact with each other and at rest. Determine which, if any, of the packages will move and the friction force acting on each package
a circular sign has a diameter of 50cm and is subjected to normal winds up to 150kmh at 10 degrees celsius and 100kpa.
If the standard material is aluminum, with kA = 200 W/m · K, and measurements reveal values of TA = 75°C and TB = 60°C at Xl for Tb = 100°C and Too = 25°C, what is the thermal conductivity kB of the test material?
a poly-dispersed aerosol consists of spherical particles within the size range 1.0-10.0 micrometers. the particles are
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