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The state of 1 lbm of steam is changed from saturated vapor at 20 psia to superheated vapor at 50 psia and 1000 F. What are the enthalpy and entropy changes of the steam? What would the enthalpy and entropy changes be if steam were an ideal gas?
estimate the wavelength corresponding to maximum emission from each of the following surfaces the sun a tungsten
1 for an astm grain size of 8 approximately how many grains would there be per square centimeter a at a magnification
a centrifugal compressor delivers 20 kgs of air at 0.32 mnm2 when running at 17500 rpm and absorbing 2800 kw. the inlet
two reversible refrigeration cycles operate in series. the first cycle receives energy by heat transfer from a cold
A 1:10 scale model study of an automobile is proposed. A prototype speed of 100km/h is desired. What wind-tunnel speed should be selected for the model study? Comment on the advisability of such a speed selection.
an insulated vertical piston-cylinder device initially contains 10 kg of water 8 kg of which is in the vapor phase. the
which of the following butt-weld preparations is usually the most susceptible to lack of sidewall fusion during the
H2O at 50 kPa and 200 degrees C is compressed in a reversible, isothermal process with steady flow until it exists as a saturated vapor. Find w, q, and draw on a t-s diagram and p-v diagram
for a specimen under fatigue test with a maximum stress of 150 mpa tensile stress and a minimum stress of -20 mpa
An Al2O3 whisker is a small single crystal used to reinforce metal-matrix composites. Given a cylindrical shape, calculate the number of Al atoms and the number of O atoms in a whisker with a diameter of 1 micrometer and a length of 25 micrometers. (..
an 84.5 kg hiker is trapped on a mountain ledge following a storm. a helicopter rescues the hiker by hovering above him
Consider a power plant operating on an ideal Rankine cycle without feed water heating. Steam enters the turbine saturated at 1000F at the rate of 5 x10 lbm/H. The turbine exhausts to a surface condenser at 1 psia. The condenser has an overall heat tr..
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