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A copper-nickel diffusion couple similar to that shown in Figure 5.1a is fashioned. After a 500-h heat treatment at 1000°C (1273 K) the concentration of Ni is 3.0 wt% at the 1.0-mm position within the copper. At what temperature should the diffusion couple be heated to produce this same concentration (i.e., 3.0 wt% Ni) at a 2.0-mm position after 500 h? The pre- exponential and activation energy for the dif- fusion of Ni in Cu are 2.7 X 10-4 m2/s and 236,000 J/mol, respectively.
a turbine that is well insulated runs on air. at steady state air enters at 0.5 mpa and 727 c and expands
water is heated by air in a heat exchanger. the water enters at 150 c and 0.2 mpa and leaves at 300 c and 0.2 mpa. the
a massive precisely machined 6-ft-diameter granite sphere rests upon a 4-ft diameter cylindrical pedestal. when the
If the lifetime earnings of a high-school graduate average $1,200,000, what is the expected value of earning a college degree?
a steel pipe of 12-in. outer diameter is fabricated from 14-in.-thick plate by welding along a helix that forms an
a piston-cylinder device containing argon gas undergoes an isothermal process at 100 c during which the pressure
consider some hypothetical x - y - ion pair for which the equilibrium interionic spacing and bonding energy values are
the 50-lb package starts from rest slides down the smooth ramp and is stopped by the spring. the coefficient of static
in a steam power plant operating on a reheat rankine cycle steam enters the hp turbine at 15 mpa and 620oc and is
a fluid flows through an adiabatic device. at one end the velocity is 30 ms h 320 kjkg and s 0.695 kjkg k and at the
A centrifugal fan equipped with damper control has the damper wide open at full flow. The damper is partly closed to reduce flow to 80 percent of full load. Estimate the changes, in percent, in static pressure, and the horsepower requirement.
The bracket plate is 25 mm thick. All rivets are to be of the same size. Load on the bracket, P = 50 kN ; rivet spacing, C = 100 mm; load arm, e = 400 mm. Permissible shear stress is 65 MPa and crushing stress is 120 MPa. Determine the size of the ri..
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