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A two-dimensional crystal has a rectangular unit cell, with spacings between the centers of the atoms of 0.5 nm in one direction (e.g., the x direction), and 0.4 nm in the other direction (e.g., the y direction). Presuming that the crystal has 1000 unit cells in each direction, sketch a representative portion of the reciprocal lattice on a scale drawing, showing the dimensions, units, and directions (i.e., kx and ky)
The number-average molecular weight of a polypropylene is 1100000 g/mol. Compute the degree of polymerization.
a waste treatment pond is 50 m long and 15 m wide and has an average depth of 2 m. the density of the waste is 85.3 lb
The figure shows an N-type cantilever truss, loaded by concentrated vertical force of magnitude P at the tip joint D.
Water at 200KPa with a quality of 25%has it temperature raised to 20degrees celcius in a constant pressure process. What is the new quality and volume?
heat transfer from a certain stationary system occurs at a rate of 50 kw. if the system performs work at a rate of 41
determine the torque that can be applied to a solid shaft of 20-mm diameter without exceeding an allowable shearing
a steam power plant operates on a rankine cycle between pressure limits of 0.08 bar and 80 bar. the heat added by
Then evaluate the hypothesis in terms of adequacy, internal coherence, external consistency, and fruitfulness.
Potassium-42 is a β emitter with a half-life of 12.36 h. Calculate the fraction of this radionuclide remaining in a sample after 1, 10. 20, 30, 40, 50, 60, 70, and 100 h. Plot the fraction remaining versus time. Determine the time required for the..
air is compressed in a steady-flow compressor via a polytropic process from 15 psia and 60ordmf state 1 to 75 psia and
moist air at 30 degrees c 2 bar and 50 relative humidity enters a heat exchanger operating at steady state with a mass
Draft tubes as shown in Fig. P12.66 are often installed at the exit of Kaplan and Francis turbines. Explain why such draft tubes are advantageous.
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