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A 45 kg machine is mounted on a spring of stiffness 8x10^5 N/m. When the machine is set to vibration by a 32 Hz excitation, the machine's amplitude is measured as 1.5mm. What is the amplitude of the excitation provided to the machine? Ignore damping and assume zero inital conditions.
a chemically reactive system contains the following species in the gas phase nh3 no no2 o2 and h2o. determine a
Saturated liquid water at 1.0 MPa is inside a pistoncylinder device, which is heated until all of the water is vaporized. Find the amount of heat transfer needed for this process. Find the change in enthalpy and the change in internal energy of nitr..
an aircraft flies at 850 fts through air at -40 f and 5 psia. the turbojet engine has a pressure ratio of 10 and the
an electric power distributor charges residential customers 0.10 per kilowatt-hour kwh. the company advertises that
a large coal fired power plant has an efficiency of 45 and produces net 1500 mw of electricity. coal releases 25000
a truck engine delivers 50hptotal to the trucks two rear axles. the truck has 36 tires and is travelling at 60 mph. a
A fuel consisting of 20% ethanol and 80% isooctane on a molar basis is burned with air in an engine. Write the balanced chemical reaction when this reaction is stoichiometric. What is the air-fuel ratio?
two hollow metal cylinders are to be press-fitted together. the outer steel member has outer and inner diameters of
a 20 cm diameter sphere is made of a heat-generating material that produces 106 wm3. the sphere is cooled by 20oc air
Three lb of water is contained in a piston–cylinder assembly, initially occupying a volume V1 5 30 ft3 at T1 5 300°F. The water undergoes two processes in series: Constant-temperature compression to V2 5 11.19 ft3, during which there is an energy tra..
five kilograms of air at 300 k is contained in a vertical cylinder by a frictionless piston of a mass such that the
if the resultant force .middotr is directed along anbspline measu red 75 clockwise from the positie x axis andnbspthe
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