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14.40 A large sheet of material 40 mm thick contains dis- solved hydrogen (H2) having a uniform concentration of 3 kmol/m3. The sheet is exposed to a fluid stream that causes the concentration of the dissolved hydrogen to be reduced suddenly to zero at both surfaces. This surface condition is maintained constant thereafter. If the mass diffusivity of hydrogen is 9 X 10-7 m2/s, how much time is required to bring the density of dissolved hydrogen to a value of 1.2 kg/m3 at the center of the sheet?
The boom OA carries a load P and is supported by two cables as shown. Knowing that the tension in cable AB is 183 lb and that the resultant of the load P and of the forces exerted at A by the two cables must be directed along OA, determine the tensio..
If the critical resolved shear stress is 10 MPa, what is the yield strength?
Hot water is provided to a house by an electric water heater which uses a 60L tank. The electric heater is rated for a 1.6kW. The hot water tank is completely full with water at 80°C when someone starts a shower. The shower faucet mixes cold water at..
a steel wide flange beam w14 x 26 carries the load. compute the maximum deflection between the supports and at each
When music wire (100% pearlite) is cold drawn, the pearlite spacing is reduced in proportion to the wire diameter. That is, d/do = D/Do, where d is the pearlite spacing and D is the wire diameter.
a 30 m x 30 m concrete floor slab is heated by 0.025 m diameter hot water pipes sunk beneath the floor surface and
the average idle human releases about 116 w of power which corresponds to a daily consumption of 2400 calories. at
Determine the ratio h/b such that the critical load
1. For each case, determine the specified property data and locate the state by hand on a sketch of the T-y diagram. (a) Evaluate the specific volume, in ft3/lb, and the specific enthalpy, in Btu/lb, of water at 400°F and a pressure of 3000 lbf/in...
water is the working fluid in an ideal rankine cycle. steam enters the turbine at 1400 lbfin2. the net power output of
floor-on ltd. operates a line that produces self-adhesive tiles. this line consists of single machine stations and is
Determine the periodic time of the motion, the maximum velocity and acceleration and (c) the velocity and acceleration when the body is 300 mm from its amplitude.
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