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The diffusivity of copper in a commercial brass alloy is 10^-20 m2/s at 500'C. The activation energy for diffusion of copper in this system is 195 kJ/mol. Calculate the diffusivity at 600'C.
a closed well insulated tank contains 10 kg of air at 300 k. an electric motor drives a propeller inside the tank
a cyclist is moving along a straight path at a speed of 18 mph. micros microd 0.43. determine the minimum distance h
10.0 kgm of air is contained in a cylinder by a free-floating frictionless piston. initially the air is at 27 c and
A 10kg block sliding along a frictionless surface with a velocity of 10m/s comes into contact with a horizontal, uncompressed linear spring. If the spring slows the block down to 0 m/s while being compressed a total of 30 cm, what is its spring const..
a chemical rocket is used for launch into earth orbit. at the end of the combusion chamber the stagnation temperature
air flows in a round pipe at a rate of 0.015 lbmsec. the air enters the pipe at a temperature 76.8 of and a pressure
a projectile is launched at a with a spped u and 45 degree launch angle. if the peak of the trajectiry is at 8 km from
consider two types of steady-state expansionthrottling devices for ammonia 1 a rigid valve amp 2 a turbine that is used
Find the stress in both members shown below and what steel specifications (types of steel) are suitable for structural applications?
a 5-ft3 tank contains 0.6-gravity natural gas at 700 psia and 60of. this tank is connected to anther tank containing
the dry bulb temperature of the air in a 4m by 3m underground opening is 26 degc. the corresponding moisture content is
a flanged coupling joins two pieces of 4-in diameter shaft. the .625 bolts are arranged in a single 8 diameter bolt
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