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Molecules that are of density row=180 kg/m3 and spe- cific heat cp = 3000 J/kg * K have an initial, relaxed length of L=2nm. The intensity of the molecular vibration increases exponentially from an initial value of Ii to a steady-state value of Iss > Ii with the time constant associated with the exponential response being pi I = 5 ps. Assuming the intensity of the molecular vibration represents temperature on the molecular scale and that each molecule can be viewed as a cylinder of initial length L and cross-sectional area Ac, determine the thermal contact resistance R"tc at the metal-moleculte interface.
The 50-lb load is hoisted by the pulley system and motor M. If the crate starts from rest and by constant acceleration attains a speed of 15 ft/s after rising s = 6 ft, determine the power that must be supplied to the motor at this instant.
The annual holding cost rate for this type of item has been estimated at 28%. What option is more economical?
compressed liquid water at 42 c and 8 mpa steadily flows into a boiler and exits as a saturated vapor at 8 mpa. the
determine the average applied force exerted on to the pile hammer. Note because the force is applied over a short time period it can be considered as an impulse force.
How many kilograms each of pearlite and the proeutectoid phase form? Schematically sketch and label the resulting microstructure.
a hovercraft has a square planform a mass of 1.8 kg and has a plenum pressure requirement of 125 pa. a levitation fan
a gas stream containing acetone vapor in air leaves a polymer drying process. a 3.0 l sample of gas at 25 deg. c 1.0
Calculate real gas pseudopressure at a pressure of 1902.7 psia using the following data and a base pressure of 102.7 psia. Was the calculation of real gas pseudopressure necessary for this gas? Explain your answer.
a shaft is subjected to a maximum load of 10 kn. it is designed to withstand a load of 15 kn. if the maximum load
In a refrigerator 1 kW is removed from the -10 degree C cold space and 1.3 kW is moved into the 30 degree C warm space. Find the exergy fluxes including direction associated with the two heat transfers.
plot the evolution of the height, h, of the stable boundary layer and the strength, delta thetas, as a function of time.
consider an ideal fuel cell to be run on pure oxygen and hydrogen for a length of time. determine the ration of the
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