(a) Determine the mean time of stay of an oxygen atom, in an interstitial site in niobium at 300 K. See Table 13.2 for the necessary diffusion parameters and take the lattice parameter, a, for niobium as 0.3301 nm.
(b) Do the same for a temperature of 400 K.
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PROBLEM 2.1
A 2.2-m-long steel rod must not stretch more than 1.2 mm when it is subjected to a 8.5-kN tension force. Knowing that E = 200 GPa, determine (a) the smallest diameter rod that should be used, (b) the corresponding normal stress in the rod.
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The heater in the thermostat control circuit in the cooling mode is active when the ____.
A. cooling contact is open B. cooling contact is closed C. fan switch is open D. fan switch is closed
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The device that automatically helps to remove non-condensables from a chiller is called a ____________________.
Fill in the blank(s) with the appropriate word(s).
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An unregistered, non-purebred horse is called a:
A. hinny B. draft horse C. grade horse D. gelding
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