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Niobium has the BCC structure with a density of 8.57 g/cm^3 , an atomic weight of 92.91 g/mol. One atom is associated with each lattice point. Calculate
a) The lattice parameter; and
b) The atomic radius of Niobium.
a four cylinder spark ignition engine has a compression ratio of 10.5 and each cylinder has a maximum volume of 0.4 l.
air initially at 85 kpa 900k and occupying a volume of 0.15 m3 undergoes two processes. the air is compressed
Consider just the vertical (y) response of the system when the beam is being stretched. Show that the spring constant, ka, is approximately 70.6 mN/m. What is the steady state amplitude of the vertical response? See Figure A below for an engine..
current automotive air conditioners use r134a as a working fluid. assume an evaporator temperature of 0c in practice
chilled water enters a thin shelled 4 cm diameter 200 m long pipe at 7 deg. celsius at a rate of 0.98 kgsec and leaves
the yield of a chamical process is being studied. from previous experience with disprocess the standart deviation of
Compare the ideal COP of R-134a and R-22 at an evaporating temperature of 40 F and 20 F superheat and condensing temperature of 120 F with 15 F sub cooling with the actual compressor COPs calculated from the manufacturer's performance tables.
calculate the mass of the sun noting that the period of the earths orbit around the sun is 3.156 107 s and its distance
steam at 2.5 mpa and 400 c enters an adiabatic steam turbine with a low velocity and leaves with a velocity of 180 ms
an actual refrigerator absorbs 500 kj of heat from a sink at 250 k and reject 660 kj of heat to environment at 300 k.
a carnot engine operates between two reservoirs maintained at 400 degrees celcius673.15k and t2 respectively. the heat
an n-type extrinsic semiconductor has an electron concentration of 5x1017 m-3. if the electron drift velocity is 350 ms
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